BOXY TRUCKS
A grey lifted Jeep Wrangler JK Unlimited on a rocky gravel summit with pine forest and snow-capped mountains behind
JEEP WRANGLER UNLIMITED · JK · 2007–2018

Wrangler JK Unlimited

JK UNLIMITED116 IN WHEELBASE3.8 EGH V6 · 3.6 PENTASTARSOLID AXLES FRONT & REARFOUR-DOOR CONVERTIBLE

“The Jeep that let Wrangler people have children, friends and luggage at the same time. The four-door JK turned a toy into a family car and an overland platform, and by 2017 three in four new Wranglers for sale were four-doors. Get the Pentastar, check the front end, and pack lighter than you think.”

PART 01

Overview

Where it came from, why it matters, and how it changed year to year.

The story

On April 12, 2006, at the New York Auto Show, Jeep did something it had resisted for 65 years: it put four doors on a Wrangler. The JK Unlimited kept everything that made a Wrangler a Wrangler (a separate frame, solid axles at both ends, a windshield that folds and doors that come off) and added 20.6 inches of wheelbase so adults could sit in the back. It was priced from $21,000. Purists predicted disaster. By mid-2017, three-quarters of the new Wranglers listed for sale were four-doors.

LONGER THAN EVERYTHING BEFORE IT

Jeep had stretched its short-wheelbase rig before, with the CJ-8 Scrambler and the TJ-based Wrangler Unlimited (LJ), but both added about 10 inches and kept two doors. The JK Unlimited added 20, for a 116-inch wheelbase against the two-door JK's 95.4, and yet it was only 14 inches longer overall than the 2006 LJ. It went on the line in August 2006 alongside the two-door at Toledo, Ohio, and it was the only four-door convertible on sale in America from the death of the Hummer H1 until the Ford Bronco arrived in July 2021.

Mechanically it is the same truck as the two-door. Driving Line's buyer's guide calls the two nearly identical and admits a soft spot for the Unlimited. X (later Sport), Sahara and Rubicon trims were offered from day one. Base trucks got a Dana 30 front axle, a Dana 44 rear and the Command-Trac transfer case with a 2.72:1 low range. The Rubicon added Dana 44s at both ends with electric Tru-Lok lockers, the 4:1 Rock-Trac transfer case and an electronically disconnecting front sway bar. Two-wheel-drive Unlimiteds were sold until 2010; from 2011, every one was a 4x4.

3.8 VERSUS 3.6

The JK's original engine was the minivan-derived 3.8-liter EGH V6, rated at 202 hp and 237 lb-ft, with a six-speed NSG370 manual or a four-speed 42RLE automatic. In a heavy four-door it was hard work, and Driving Line lists its habits: burning oil, intake-gasket failures, cracked exhaust manifolds, and a heat-stressed automatic once owners fitted bigger tires. The 2011 update gave the cabin a proper redesign, but the engine had to wait.

For 2012 the Pentastar 3.6 arrived with 285 hp and 260 lb-ft, plus a five-speed W5A580 automatic. Quadratec's spec history says it stopped being a 'rolling brick'. The Pentastar isn't flawless: some 2012–2013 Wrangler engines (2011–2013 across Chrysler's range) got a 10-year/150,000-mile warranty on the left cylinder head, and the plastic oil filter housing in the valley is a known leaker. It's still the JK engine to buy, and Driving Line recommends a 2013 or later truck for daily use.

THE OVERLAND JEEP

The long wheelbase changed what a Wrangler was for. The four-door rode better, had a usable cargo area behind the rear seat and was rated to tow 3,500 lb against the two-door's 2,000. An industry grew up around it: roof racks, drawer systems, bumpers, and full conversions such as AEV's Brute, a 139-inch-wheelbase double-cab pickup inspired by the Defender 130. Mopar's own JK-8 Independence kit turned an Unlimited into a two-seat pickup in 2011.

The catch is weight. Payload is roughly 900 to 1,300 lb depending on year, trim and source, and a JKU with steel bumpers, a winch, a rooftop tent and two adults goes through that quickly. Expedition Portal's long-running payload thread is full of owners over their door-sticker rating. Their advice: spend on springs and shocks, and cut weight before you add more armor.

HOW IT ENDED

Toledo built its millionth JK on May 17, 2013. The JK's last model year, 2018, overlapped the new JL Unlimited, and fender decals told the two apart. Production ended on April 27, 2018, and the plant was retooled to build the JL-based Gladiator pickup. The JL kept the formula and fixed much of what JK owners complained about, but it didn't make the JKU obsolete. A well-sorted 2012–2018 Unlimited is still one of the cheapest ways into a solid-axle overland rig that will happily take 35s, and it is far easier to find parts for than a Land Cruiser 80.

SIDEBAR · THE UNLIMITED GOES TO WORK

Mail carriers, soldiers and the J8

Jeep built right-hand-drive Wranglers for US rural mail carriers, and for 2009 that job moved from the two-door to the right-hand-drive Unlimited.

In September 2007 Chrysler showed the J8, a military Unlimited with larger brakes, axles and suspension, heavy-duty rear leaf springs and a 2,952-lb (1,339 kg) payload. Power came from a 2.8-liter VM turbodiesel, and a hood-mounted snorkel allowed 30 inches of wading. It was to be built in Egypt and was never sold in the US, because it couldn't meet US emissions rules.

A grey lifted Jeep Wrangler JK Unlimited on a rocky gravel summit with pine forest and snow-capped mountains behind
JK UNLIMITED · BALD MOUNTAIN, COLORADO
A white Jeep Wrangler JK, seen head-on, cresting a rocky dugway under a deep blue sky in Emery County, Utah
JK WRANGLER · EMERY COUNTY, UTAH
A silver lifted Jeep Wrangler JK Unlimited leading a line of 4x4s up a steep dirt trail in wooded hills
JK UNLIMITED · CHAPPIE-SHASTA OHV AREA, CALIFORNIA
A red Jeep Wrangler JK Unlimited fording the shallow upper Salt River between gravel bars
JK UNLIMITED · UPPER SALT RIVER, ARIZONA

Year by year

What changed, model year by model year. Sweet spot Beware

  1. 2007JK launch (production from August 2006): 3.8 EGH V6 (202 hp) with a 6-speed manual or 4-speed 42RLE auto; Rubicon has Dana 44s with Tru-Lok lockers, 4:1 Rock-Trac and an electronic sway-bar disconnect. The four-door Unlimited is new.
  2. 2009Hill Start Assist standard; Trailer Sway Control available
  3. 2010Easier-folding soft top; Uconnect on MyGig-equipped trucks
  4. 2011Fully redesigned interior with steering-wheel controls, Bluetooth, and available heated seats and leather. Mopar's JK-8 pickup kit for the Unlimited also arrives.
  5. 20123.6 Pentastar V6 (285 hp, 260 lb-ft) and 5-speed W5A580 automatic replace the 3.8 and the 4-speedSweet spot
  6. 2012–13Some Pentastars have faulty left cylinder heads (misfire codes); covered by the X56 extension to 10 years/150,000 miles
  7. 2013Second windshield-washer nozzle returns; one-handed rear-seat fold; Moab edition with AEV bumpers. The millionth JK is built in May 2013.
  8. 2014Clear park and turn lamps; optional 6.5 in Uconnect; Rubicon X edition
  9. 2015Willys Wheeler and Rubicon Hard Rock join the range; Torx tool kit for doors and windshield standard; Alpine audio optionSweet spot
  10. 2018Final year, sold alongside the new JL with 'Wrangler JK' fender decals; Golden Eagle edition. Production ends April 27, 2018.
PART 02

Specs & capability

How it’s built, what it can do, and what fits under it.

How it’s built

The JK Unlimited is a body-on-frame four-door convertible with coil springs and solid axles front and rear, part-time four-wheel drive with a two-speed transfer case, and a 116-inch wheelbase. Unlike the TJ it replaced, it runs nearly everything except the steering through computer control, and it brought stability control to the Wrangler for the first time.

CHASSISLadder frame, 116 in wheelbase20.6 in longer than the two-door JK's 95.4 in; about 185 in overall.
FRONT AXLEDana 30 (Sport/Sahara) · Dana 44 (Rubicon)Driving Line rates the Dana 30 at about 35-in tires; on both axles the tubes and C-ends can bend.
REAR AXLEDana 44Rubicon gets an electric Tru-Lok locker; Trac-Lok limited slip was optional on other trims. Quadratec says a few very early trucks had a Dana 35.
4WD SYSTEMCommand-Trac 2.72:1 · Rock-Trac 4:1Both are versions of the NV241 part-time case; the 4:1 low range was Rubicon-only.
ENGINE3.8 EGH V6 (2007–11) · 3.6 Pentastar V6 (2012–18)202 hp / 237 lb-ft, then 285 hp / 260 lb-ft. A 2.8 VM diesel was sold outside the US.
RUBICON EXTRASFront & rear lockers, sway-bar disconnectPlus 4.10 gears, 32-in BFGoodrich mud-terrains and rock rails.

Variants & engines

YEARSPLATFORMENGINEOUTPUTWORTH KNOWING
2007–2011JK Unlimited 3.83.8 L EGH V6202 hp / 237 lb-ftNSG370 6-speed manual or 42RLE 4-speed auto. 4x2 Unlimited offered until 2010; interior redesign for 2011.
2012–2018JK Unlimited 3.63.6 L Pentastar V6285 hp / 260 lb-ftNSG370 manual or W5A580 5-speed auto. Quadratec says the oil filter changed for 2014.
2007–2018Rubicon UnlimitedAs above—Dana 44 axles front and rear with Tru-Lok lockers, Rock-Trac 4:1, electronic sway-bar disconnect, 4.10 gears.
2011–2018 (export)Unlimited CRD2.8 L VM turbodiesel I4200 PSUpgraded 2.8 from 2011 with the five-speed W5A580. Not sold in the US.
From c. 2012AEV BruteVarious—Aftermarket 139-in-wheelbase double-cab pickup conversion of the Unlimited, retired after four years.
2018JK Unlimited (final year)3.6 L Pentastar V6285 hp / 260 lb-ftSold alongside the new JL, with 'Wrangler JK' fender decals; production ended April 27, 2018.

Capability numbers

Towing3,500 lb (1,588 kg)
Payload1,000–1,150 lb (454–522 kg)2007–11; Quadratec's two spec sheets disagree
Fuel tank21.6 gal (82 L)2007 spec
Ground clearance (axle)10.5 in front / 10.1 in rear (267 / 257 mm)Rubicon on LT255/75R17
Approach / departure / breakover44.4° / 40.5° / 20.8°Rubicon on LT255/75R17
Fuel economyEPA 16 city / 20 hwy2017, 3.6 automatic (16/21 manual)
Curb weight4,075–4,340 lb (1,848–1,969 kg)2007–2011 X manual to Rubicon auto
Turning circle41.2 ft (12.56 m)curb to curb, 225/75R16 tires
Wheelbase116.0 in (2,946 mm)

Wheels & tires

FACTORY TIRES
P225/75R16 (X/Sport)P245/75R16 (option)P255/75R17 (Sahara)P255/70R18 (Sahara option)LT255/75R17 BFGoodrich Mud-Terrain (Rubicon)
Bolt pattern5x127 (5x5")
Center bore71.5 mm
Lug thread1/2"-20 (60° cone seat)
Lug-nut torque100 lb-ft (Northridge4x4); ExtremeTerrain gives an 85–125 lb-ft range [CONFIRM IN MANUAL]
LIFTBIGGEST TIREWHAT IT TAKES
Stock33 in (e.g. 285/70R17)JEGS puts the stock-height limit at about 33 in. Driving Line fitted 35x12.50R17s to a stock-height 2017 JK Unlimited Sport on 4.75 in-backspacing wheels after removing the front splash guard, and concluded that real off-road use needs aftermarket or heavily trimmed flares.
2.5 in35x12.50 or 285/75R17285/75R17 works on factory 17s; 35x12.50 wants 18x9 or 20x9 wheels at about 0 to +1 mm offset.
3.5 in37 inJEGS says 37s need about 3.5 in of lift and advises axle, driveshaft and gearing upgrades; 40s need about 4.5 in.

Forum consensus, not a guarantee: wheel offset, tire brand and suspension wear all change clearance. Confirm before you buy.

Production & special editions

The JK Unlimited debuted at the April 2006 New York show and was the only four-door convertible on sale in the US until the 2021 Bronco.

ProductionAugust 2006 – April 27, 2018 (Toledo, Ohio)
Launch priceAbout $21,000 (2007)
Body mixBy mid-2017, three-quarters of new Wranglers listed for sale were four-doors
US Wrangler sales, 2007–20171,560,169 (all body styles, calendar years)
Mountain2010Black grille and hood decals, 32 in tires on 17s
70th Anniversary2011Sahara-based; leather with Chestnut stitching, 18 in polished wheels
Call of Duty: MW32012Rubicon-based, with AEV front and rear bumpers and hood; serialised dash plaque
Moab2013AEV bumpers and hood, rock sliders, Trac-Lok rear; no 4:1 transfer case
10th Anniversary Rubicon2013Marked the Rubicon's 10 years; the millionth JK was one
Rubicon X2014Steel bumpers, Power Dome hood and full Rubicon drivetrain
Willys Wheeler / Rubicon Hard Rock2015–Added to the trim line-up for 2015
Golden Eagle2018Bronze accents; the only JK offered with a beige top

2014 added Amp'd, Anvil, Copperhead, Flame Red, Granite Crystal and Hydro Blue; 2015 added Tank, Sunset Orange, Copper Brown, Baja Yellow and Firecracker Red.

PART 03

Buying one

What to pay, what to check, and how to tell a good one from a clone.

What they cost

Four-doors carry a premium over the two-door, and swapped or AEV-built Rubicons go well past what any stock JK brings.

Project / high-mile$6.5k–14k
Driver$14k–27k
Excellent / Hemi-swapped or AEV-built$27k–46k

Based on 80 JK Unlimited sales on Bring a Trailer in 2025–26: median about $19.5k. Every sale above about $35k was a Hemi-swapped or AEV-built Rubicon or a sub-10k-mile truck. Prices move; checked October 2026. See live listings below.

What to check before you buy

  1. 01
    Pick your engine first2007–2011 trucks have the 3.8 and four-speed automatic; 2012–2018 have the Pentastar and five-speed. Driving Line suggests 2013 or later for a daily driver and says any year is fine for a weekend trail rig.
  2. 02
    Drive it over a pothole at 50 mphDeath wobble usually shows up at 45–65 mph after a bump. Have someone turn the wheel a quarter turn each way with the engine running while you watch both ends of the front track bar. Any movement at the bushing or bracket is a red flag.
  3. 03
    Look at the oil filter housingOn a 3.6, pull the engine cover and look for oil in the valley at the back of the engine, and for oil on the bellhousing. The plastic housing is a known leaker. Curbside Classic's 2015 JK started leaking at about 55,000 miles.
  4. 04
    On a 3.8, check for oil burning and manifold ticksAsk how much oil it uses between changes, and listen for a cold-start exhaust tick, which can mean a cracked manifold. Driving Line also lists intake-gasket failures and, on hard-used engines, ring and main-bearing failures from about 100,000 miles.
  5. 05
    2012–2013: ask about the left cylinder headChrysler extended the warranty on the left cylinder head of affected 2012–2013 Wrangler Pentastars (2011–2013 across its range) to 10 years or 150,000 miles; its bulletin covers excessive cylinder leakage showing up as misfire codes. Ask whether the head has been replaced and get the dealer record.
  6. 06
    Sight down the front axleOn lifted trucks with big tires, look for bent axle tubes or C-ends and uneven tire wear. Check for a truss. A bent Dana 30 housing usually means replacing it, often with a Dynatrac or Currie unit.
  7. 07
    Weigh the build against the door stickerBumpers, a winch, a rack and a tent can put a JKU over its payload before anyone gets in. Check the sticker, and look at the rear coils and the bump-stop gap for sag.
  8. 08
    Modified Jeeps: price the parts, then get a shop inspectionDriving Line's advice is to research every listed aftermarket part, have a 4x4 shop inspect the truck, and assume a heavily built Jeep has had a hard life.

Spotting the real thing

The Unlimited is the JK most people actually bought, so condition, hardware and the swap history decide the price more than the badge does.

  1. ID
    Real RubiconDana 44 axles front and rear with Tru-Lok electronic lockers, Rock-Trac transfer case with 4:1 low range, 4.10 gears and an electronic sway-bar disconnect switch. Sport and Sahara trucks have Command-Trac with 2.72:1 low range.
  2. ID
    Axles by trimSport (X) and Sahara have a Dana 30 front and a Dana 44 rear; Quadratec says fewer than a thousand early 2007s got a Dana 35 rear instead. Rubicon has Dana 44s at both ends. A rear locker was optional on X and Sahara for 2007, then on select X models for 2008–2009.
  3. ID
    Engine and year2007–2011 trucks have the 3.8 EGH V6 (4-speed 42RLE auto or 6-speed manual). 2012–2018 trucks have the 3.6 Pentastar (5-speed W5A580 auto or 6-speed manual). 2011 got the new interior a year before the new engine.
  4. ID
    Four-door vs TJ UnlimitedThe JK Unlimited's wheelbase grew by 20.6 in to 116 in, a true four-door rather than the stretched two-door TJ Unlimited. Two-wheel-drive Unlimiteds (X and Sahara) were sold only through 2010.
  5. ID
    Hemi swaps and AEV buildsPlenty of Unlimiteds carry 5.7 or 6.4 Hemi swaps or AEV conversions (AEV's 'Brute' double-cab pickup ran about four years). Ask for the build paperwork and an emissions-compliance record for your state.
  6. ID
    Postal right-hand driveFrom 2009 the factory right-hand-drive Wrangler was an Unlimited. These have their own RHD-only recalls.

Recalls & service bulletins

Open recalls follow the VIN, not the model. Run yours through NHTSA before you buy, and ask the seller for dealer records showing recall work.

Check a VIN at NHTSA ↗
Notable recalls
Driver airbag clockspring ↗2007–2010 · NHTSA 16V-290Dust can contaminate the clockspring so the driver's airbag may not deploy; Chrysler recall S33, 388,532 vehicles.
Takata passenger airbag inflator ↗2007–2012 · NHTSA 16V-352Passenger airbag inflator may rupture as the propellant degrades; this campaign covered trucks sold or registered in hot, humid states.
Takata passenger inflator (Zone A states) ↗2009–2013 · NHTSA 18V-021Passenger inflator replacement for trucks sold or registered in hot, humid states (recall U03).
Driver airbag inflator ↗2010–2016 · NHTSA 19V-018Driver inflator may over-pressurise and explode on deployment (recall V01).
Automatic transmission overheat warning ↗2007–2008 · NHTSA 09V-436Autos lacked a fluid-temperature warning; fluid could boil over onto hot parts. Dealers add a 'HOT OIL' message and chime (recall J30).
Front brake lines vs inner fender liner ↗2007–2010 · NHTSA 10V-236Inner fender liners can rub through front brake hoses and cause a leak (recall K13).
Axle-to-chassis fastener torque ↗2010–2011 · NHTSA 11V-145Front and rear axle attachment fasteners could lose torque; dealers re-torque all 19 (recall L09).
Power-steering line rubs transmission cooler tube ↗2012–2013 · NHTSA 13V-2343.6 automatics: the power-steering return line can wear a hole in the transmission cooler tube (recall N28, 180,131 vehicles).
Heated mirror connector short ↗2011–2013 · NHTSA 14V-631Corrosion in the heated power-mirror connector can short.
Front impact sensor wiring ↗2016–2017 · NHTSA 16V-734Sensor wiring can pull loose in some crashes before it signals the airbags.
Right-hand-drive (postal) Unlimited airbag clockspring ↗2011–2016 (RHD) · NHTSA 16V-288Right-hand-drive (postal) trucks built February 2010 to May 2016: dust can contaminate the clockspring and disable the driver's airbag. Earlier RHD trucks were covered by 11V-528 and 13V-176 (2008–2012).
Right-hand-drive driver seat belt buckle strap ↗2011–2018 (RHD) · NHTSA 19V-680The buckle mounting strap may fracture and separate from the seat frame (recall VA6).
Service bulletins & known fixes
Death wobble: Chrysler steering-vibration bulletin ↗In August 2012 Chrysler sent dealers a bulletin acknowledging the solid-axle shimmy, naming aftermarket parts, wrong tire pressures and worn steering and suspension components as causes. NHTSA had earlier concluded the condition doesn't cause loss of control.
Shimmy with the 4-inch Mopar lift ↗TSB 02-001-162012–2015 JKs built before June 15, 2015 with the Mopar 4 in lift: replace the front axle track bar bracket and recheck alignment (supersedes 02-008-15).
3.6 Pentastar left cylinder head (X56) ↗TSB 09-002-14 Rev. A2012–2013 JKs with misfire codes P0300/P0302/P0304/P0306: check cylinder leakage and replace the left head. Warranty Bulletin D-14-12 extended head coverage to 10 years/150,000 miles.
Water leaks ↗Bulletins cover cowl trim panel fastener leaks (water on the front floor, 2012–2014), door and windshield-frame gaps, and Freedom Top centre-seal leaks.
The one you’ll own someday

For sale now

2007–2011 · USJK Unlimited 3.8
AutoTempest ↗Bring a Trailer ↗
2012–2018 · USJK Unlimited 3.6 Pentastar
AutoTempest ↗Bring a Trailer ↗
2007–2018 · USAll JK Unlimited
AutoTempest ↗Bring a Trailer ↗
PART 04

Owning one

Baseline service, the repairs you’ll actually do, and where the manuals live.

Post-purchase baseline

After you buy it

With no receipts, assume nothing has been done. Change every fluid, and know which engine you have: the 3.8 (2007–2011) and the Pentastar (2012–2018) use different filters, plugs and automatic transmissions. Check the Pentastar's oil filter housing for leaks at the first oil change. Then do the gear oil, which is the service owners skip most. Rubicons and trucks with Trac-Lok need the right axle oil, and a limited-slip axle needs friction modifier.

Engine oil & filter3.6: 6 qt SAE 5W-20 meeting MS-6395 (5W-30 permitted) · 3.8: 6.0 qt with filter, 5W-20 or 5W-30 per the filler capThen per the oil-life monitor or owner's manual [CONFIRM IN MANUAL]

The Pentastar uses a cartridge filter under a 24 mm cap on top of the engine. Quadratec notes the filter changed for 2014, so buy for your year, and says to pull the old element gently because the pressure-relief valve is in the cap. Don't overtighten the cap; Curbside Classic gives 18 lb-ft.

Parts
aFe Pro Guard D2 oil filter (4-pack), 2012–2013 JK 3.6Quadratec ↗ · Amazon ↗
JK oils and fluidsExtremeTerrain ↗ · Amazon ↗
Oil filter catalog, 2015 WranglerRockAuto ↗
Engine air filterPanel filter in the airboxInspect at every oil change; more often on dusty trails

If a snorkel or aftermarket intake is fitted, check the clamps and seals as well as the element.

Parts
Crown 53034018AE replacement air filter, 2007–2018 JKQuadratec ↗ · Amazon ↗
Cabin air filterQuadratec lists JK cabin filters from the 2011 model year onReplace when dirty [CONFIRM IN MANUAL]

Quadratec lists separate cabin filters for 2011–2013 and later JKs.

Parts
Crown 55111302AA cabin air filter 2-pack, 2011–2013 JKQuadratec ↗ · Amazon ↗
Spark plugs3.6 Pentastar: 0.043 in (1.10 mm) gapKBB's schedule lists spark plugs at 100,000 mi

Pentastar plugs are under the intake plenum on the rear bank, so it's a good time to look for oil filter housing seepage. 3.8 plugs: [CONFIRM IN MANUAL].

Parts
Mopar SP149125AF spark plug, 2012–2024 JK/JL 3.6Quadratec ↗ · Amazon ↗
OMIX 17248.12 spark plug, 2012–2020 JK/JL V6Quadratec ↗ · Amazon ↗
Coolant, thermostat & hoses3.8 and 2012 3.6: HOAT 5-year/100,000-mile, about 13 qt · 2013–18 3.6: Mopar 10-year/150,000-mile OAT (MS.90032), 10.5 qt (ExtremeTerrain)KBB's schedule lists coolant at 100,000 mi; inspect hoses at every service

Don't mix HOAT and OAT; check what's in the tank before topping up. On a 3.6, a coolant leak in the valley can come from the oil cooler, not the water pump.

Parts
Mopar 68163848AB antifreeze coolant (concentrate)Quadratec ↗ · Amazon ↗
Crown 68210220AA thermostat, 2007–2011 JKQuadratec ↗ · Amazon ↗
Crown 55111394AC upper radiator hose, 2012–2018 JKQuadratec ↗ · Amazon ↗
Automatic transmissionW5A580 (2012–18): Mopar ATF+4, 5.3 qt service fill / 8.1 qt overhaul · 42RLE (2007–11): ATF+4, about 4.0 qt drain-and-fill / 8.8 qt totalKBB lists transmission fluid at 100,000 mi; sooner if you tow or run big tires

Driving Line says heat kills both automatics, especially with oversized tires, towing or hard off-road use, and recommends an auxiliary cooler and proper gearing. A drain-and-fill with a new filter is the usual DIY.

Parts
Mopar 68218058AC ATF+4, 2009–2016 JKQuadratec ↗ · Amazon ↗
Mopar 52108325AA transmission oil filter, 2012–2018 JKQuadratec ↗ · Amazon ↗
Manual transmission (NSG370)Mopar manual transmission lubricant meeting MS-9224 · 1.6 qtChange on a truck with unknown history [CONFIRM IN MANUAL]

Driving Line says the NSG370 can grind, pop out of gear and get noisy, and recommends regular fresh fluid. A 2007 lube chart gives 22 ft-lb for the fill and drain plugs.

Parts
JK oils and fluidsExtremeTerrain ↗ · Amazon ↗
Transfer case (NV241 Command-Trac / Rock-Trac)Mopar ATF+4 · 2.1 qtChange on purchase, then per the severe-service schedule [CONFIRM IN MANUAL]

Remove the fill plug before the drain plug. Both are chain-driven cases with aluminum housings (Driving Line), so don't overtighten the plugs.

Parts
Mopar 68218058AC ATF+4Quadratec ↗ · Amazon ↗
Front axleGL-5 80W-90 · Dana 30 (186 FBI): 2.1 pt · Dana 44 (216 FBI, Rubicon): 2.7 ptChange on purchase and after deep water crossings

If the oil looks milky, water has got in through the axle vent or seals.

Parts
Yukon 80W-90 conventional gear oilQuadratec ↗ · Amazon ↗
Gear oil 80W-90 (search)Quadratec ↗
Rear axle (Dana 44)GL-5 80W-90 · 226 RBI: 4.75 pt · synthetic 75W-140 for trailer towing · add 4 oz Mopar limited-slip additive to Trac-Lok axlesChange on purchase; more often if you tow

A tag on the cover marks a limited-slip axle. Rubicon lockers don't need friction modifier.

Parts
Yukon 80W-90 conventional gear oilQuadratec ↗ · Amazon ↗
Currie CE-9013S 75W-140 gear oilQuadratec ↗ · Amazon ↗
Power steering fluidMopar Power Steering Fluid +4 or Mopar ATF+4Refresh the reservoir if the fluid is dark

Big tires work the steering box hard. Look for leaks at the box and the pressure lines.

Parts
Mopar 68218058AC ATF+4Quadratec ↗ · Amazon ↗
Brake & clutch fluidMopar DOT 3 (DOT 4 acceptable if DOT 3 isn't available)Flush on purchase, then every 2–3 years [CONFIRM IN MANUAL]

Manual trucks share the fluid type in the clutch master cylinder.

Parts
Mopar DOT 3 brake fluidQuadratec ↗ · Amazon ↗
U-joints & driveshaftsFront axle-shaft U-joints, plus driveshaft joints where greaseableInspect at every oil change; grease any zerks

Rubicon Dana 44 front U-joints take a beating with lockers and big tires, so carry a spare.

Parts
Dana Spicer SPL30-7166XC Blue Series Dana 44 front axle U-joint, JK RubiconQuadratec ↗ · Amazon ↗
Dana Spicer SPL30-1350XC driveshaft U-joint, 2012–2021 JK/JLQuadratec ↗ · Amazon ↗
PCV valveEngine-specificInspect with the plugs

A sticking PCV valve adds to oil consumption, which matters on a 3.8.

Parts
Mopar 68083202AC PCV valve, 2012–2018 JK 3.6Quadratec ↗ · Amazon ↗
For the hands-on owner

Common repairs

The jobs owners actually end up doing, rated for a competent home mechanic with a decent tool kit. Always confirm torque figures, fluids and procedures against the factory service manual for your VIN, and work safely — support the truck on stands, never just a jack. You do this work at your own risk; see the disclaimer. Some parts links are affiliate links.

Chase down death wobble (track bar first)
DIFFICULTY · 2 / 5TIME · ≈ 1–3 hours to diagnose; longer if parts need replacingSHOP COST · From free (re-torquing) to about $250–$400 for a JK track bar, per ExtremeTerrain's price guide
SYMPTOMSViolent side-to-side shaking of the steering wheel and front axle, usually at 45–65 mph after a bump or bridge seam, which stops only when you slow right down.
THE FIXCheck the front track bar first: with the engine running, have a helper turn the wheel a quarter turn each way while you watch both ends. If the bar moves without the bolt, or one end moves and the other doesn't, the bushing or bracket is worn. ExtremeTerrain lists the frame-side bolt at 125 ft-lb. Then work through the ball joints, tie-rod and drag-link ends, control-arm bushings and wheel bearings, and check tire balance and pressure. Replace whatever is loose, re-torque everything with the Jeep on the ground, and get an alignment. Quadratec and ExtremeTerrain both warn that a new steering stabilizer only hides the cause.
TOOLS & PARTSHelper · torque wrench · large sockets · pry bar · floor jack and stands · paint pen to mark bolts.
WHERE TO BUY PARTSMopar front track bar 52059982AG, 2007–2018 JK · Quadratec ↗Amazon ↗Crown Automotive front track bar 52059982AD, 2007–2018 JK · Quadratec ↗Amazon ↗Teraflex 835770 track bar bushing, 2007–2018 JK · Quadratec ↗Amazon ↗JK track bars (stock and adjustable) · ExtremeTerrain ↗Amazon ↗
Replace the Pentastar oil filter housing / cooler (2012–2018)
DIFFICULTY · 3 / 5TIME · ≈ 6 hours the first time (one owner's log)SHOP COST · Housing plus gaskets and an oil change; tools under $30 for one owner
SYMPTOMSOil pooling in the valley under the intake, running over the back of the engine and dripping from the bellhousing. Sometimes coolant leaks too.
THE FIXRemove the engine cover and intake duct, then disconnect the injectors, coils, vacuum lines and brackets. Take off the upper intake (seven 8 mm bolts) and the lower manifold (eight bolts). Unplug the two sensors on the cooler and remove its five E8 external-Torx bolts. Mop the oil out of the valley, move the sensors and fittings to the new aluminum housing, fit new gaskets and O-rings, and torque in sequence. Reassemble, then refill the oil and coolant. Plug the intake ports with towels while you work. Don't overtighten the filter cap, which is specified at 18 lb-ft. Curbside Classic suspects overtightening contributes to the cracking.
TOOLS & PARTSE8 external-Torx socket · 27 mm and 19 mm deep sockets · inch-pound torque wrench · hose clamp pliers · trim tool · shop vac · Dorman 926-876 aluminum housing (as used by Curbside Classic).
WHERE TO BUY PARTSCrown 68105583AF oil filter and cooler assembly, 2014–2016 JK 3.6 · Quadratec ↗Amazon ↗Crown 5184294RK oil filter adapter repair kit, 2012–2013 JK 3.6 · Quadratec ↗Amazon ↗Mopar/Dorman 68755454AA aluminum oil filter housing with element (check fitment) · Quadratec ↗Amazon ↗Engine catalog (Dorman 926-876 and gaskets), 2015 Wrangler · RockAuto ↗
Replace a cracked 3.8 exhaust manifold (2007–2011)
DIFFICULTY · 3 / 5TIME · ≈ Half a day per side, more if studs breakSHOP COST · Manifold plus gaskets and studs; studs that snap add drilling time
SYMPTOMSA ticking or puffing noise at cold start that quietens as the engine warms, a smell of exhaust in the engine bay, and soot marks at the manifold-to-head joint.
THE FIXDriving Line names cracked exhaust manifolds as a 3.8 weak point. Soak the studs in penetrating oil the night before. Unbolt the heat shield and the downpipe flange, then remove the manifold nuts. Inspect the studs and replace any that are stretched or corroded. Clean the head flange, fit new gaskets and a new manifold, and torque the nuts evenly from the center out. Check the oxygen sensor connectors and the downpipe gasket while you're in there.
TOOLS & PARTSPenetrating oil · long extensions and swivels · stud extractor · torque wrench · new manifold studs and nuts.
WHERE TO BUY PARTSOMIX 17626.02 exhaust manifold, 2007–2011 JK 3.8 · Quadratec ↗Amazon ↗AccuPart exhaust manifold, 2007–2011 JK 3.8 · Quadratec ↗Amazon ↗Mopar 04892409AA exhaust manifold gasket, 2007–2011 JK 3.8 · Quadratec ↗Amazon ↗JK stock replacement exhaust · ExtremeTerrain ↗Amazon ↗
Press in new front ball joints
DIFFICULTY · 4 / 5TIME · ≈ A day for both sidesSHOP COST · About $40–$60 a pair for stock joints, $200–$250 for a heavy-duty set of four (ExtremeTerrain)
SYMPTOMSClunks over bumps, wandering, uneven tire wear, or play when you rock a lifted wheel top to bottom. Worn joints can contribute to death wobble.
THE FIXLift and support the axle, then remove the wheel, caliper, rotor, ABS sensor and the hub/bearing. Pull the axle shaft, then separate and remove the knuckle. Press out the upper and lower joints with a ball-joint press and the correct adapters, and press in the new ones square. Refit everything, torque to the factory figures (Northridge4x4 lists 75 ft-lb for the ball-joint nuts, 75 ft-lb for the hub bolts and 100 ft-lb for the axle nut), and get an alignment. Many owners replace the hub bearings and axle-shaft U-joints at the same time.
TOOLS & PARTSBall-joint press and JK adapter set · axle-nut socket · breaker bar · torque wrench · pickle fork or hammer for the tapers.
WHERE TO BUY PARTSYukon YSPBJ-001HDK2 ball joint kit, JK Dana 30/44 · Quadratec ↗Amazon ↗OMIX 18036.05 genuine Dana Spicer ball joint kit, 2007–2018 JK · Quadratec ↗Amazon ↗DV8 Offroad D-JKBLJNT-01 four-piece ball joint kit, JK Dana 30/44 · Quadratec ↗Amazon ↗JK tie rods, ends and ball joints · ExtremeTerrain ↗Amazon ↗
Replace a front hub and bearing
DIFFICULTY · 2 / 5TIME · ≈ 1–2 hours per sideSHOP COST · A hub assembly per side
SYMPTOMSA growl that changes with speed or while turning, play when you rock the wheel at 12 and 6 o'clock, or an ABS light from a damaged sensor.
THE FIXLift the corner and remove the wheel, caliper bracket and rotor. Unplug the ABS sensor, remove the axle nut and the three hub bolts from the back of the knuckle, and pull the hub (it may need persuading). Clean the knuckle face, fit the new hub, and torque the bolts and axle nut (Northridge4x4: 75 ft-lb hub bolts, 100 ft-lb axle nut). Mopar lists different hubs for 2007–2010 and 2011–2018 JKs, so order by year.
TOOLS & PARTSLarge axle-nut socket · breaker bar · torque wrench · wire brush · anti-seize for the hub-to-knuckle face.
WHERE TO BUY PARTSMopar 52060398AE hub and bearing, 2011–2018 JK · Quadratec ↗Amazon ↗Mopar 52060398AC hub and bearing, 2007–2010 JK · Quadratec ↗Amazon ↗OMIX 16705.14 front hub and bearing assembly, 2007–2018 JK · Quadratec ↗Amazon ↗JK axles and hubs · ExtremeTerrain ↗Amazon ↗
Truss a front axle before it bends (or after)
DIFFICULTY · 4 / 5TIME · ≈ A weekend with weldingSHOP COST · Truss kit plus welding; a bent housing needs replacing, not trussing
SYMPTOMSToe that won't stay in alignment, inside-edge tire wear, or a visibly bent tube after a hard hit. It's common on lifted trucks running 35s and up on the factory axle.
THE FIXDriving Line says the small tubes and C-ends on both the Dana 30 and the Rubicon's Dana 44 can bend with oversized tires, and points to EVO Manufacturing trusses as a preventive fix. Check the housing is straight first, because a truss locks in whatever shape it has. Strip the axle (or at least remove the brackets that are in the way), grind the tubes clean, tack the truss in place, then weld in short alternating stitches to limit heat distortion. Paint it and re-check the alignment. If the housing is already bent, Dynatrac and Currie sell replacement housings.
TOOLS & PARTSMIG or stick welder · grinder · straightedge or axle-alignment check · paint.
WHERE TO BUY PARTSJCR Offroad JKF-TRUSS-D30 front Dana 30 axle truss, JK · Quadratec ↗Amazon ↗JCR Offroad JKF-TRUSS-44 front Dana 44 axle truss, JK · Quadratec ↗Amazon ↗Rough Country 10565 Dana 30 truss and gusset kit, JK · Quadratec ↗Amazon ↗EVO Manufacturing (trusses and armor) · EVO Manufacturing ↗Amazon ↗
Re-spring the rear for an overland load
DIFFICULTY · 2 / 5TIME · ≈ 2–3 hoursSHOP COST · A pair of rear coils plus shocks; more if you go to a full lift
SYMPTOMSA rear end that sags below the front, bottoms out on washboard, or sits on the bump stops with a full load of water, fuel and gear.
THE FIXWeigh the loaded truck first. Expedition Portal owners say the rear axle and suspension are the weak points under long-term heavy loads, and recommend springs and shocks rather than frame or axle changes. Support the frame, lower the axle on a jack after disconnecting the rear shocks, sway-bar links and track bar if needed, then swap the coils and fit the matching jounce bumpers. Refit at ride height and torque the suspension bolts with the Jeep on its wheels.
TOOLS & PARTSFloor jack and frame stands · sockets · torque wrench · spring compressor not usually needed on JK rear coils.
WHERE TO BUY PARTSSkyjacker dual-rate rear coil spring pair, 2007–2018 JK Unlimited · Quadratec ↗Amazon ↗OMIX 18280.26 rear coil spring jounce bumper, 2007–2018 JK · Quadratec ↗Amazon ↗JK coil springs · ExtremeTerrain ↗Amazon ↗

Manuals & documentation

Owner's manuals (official) ↗Mopar's owner's-manual lookup by model year; free digital manuals for JK and JL Wranglers.Printed owner's manuals — TechAuthority ↗FCA US's official store for ordering printed owner's manuals by brand.NHTSA recall and service-bulletin lookup ↗Free VIN recall check; manufacturer service bulletins (TSBs) for each model year are posted under the vehicle's record.
Asked on every forum

Wrangler JK Unlimited questions, answered

What's the biggest tire I can fit without a lift?

33s. JK-Forum owners agree that most 285/70R17s (about 33 inches) fit on stock wheels, at stock height, with the stock bump stops. Expect light rubbing at full lock and at full flex, where they touch the flares, liners and sometimes the front sway bar. A steering-stop washer and the right backspacing help. ExtremeTerrain says 35s need at least a 2–3-inch lift, the right wheel offset and possibly new gears.

SOURCE · JK-FORUM · EXTREMETERRAIN
3.8 or 3.6?

The 3.6 Pentastar (2012–2018) by a mile: 285 hp against 202, plus a five-speed automatic instead of the four-speed. The 3.8 is known for burning oil, intake-gasket leaks and cracked exhaust manifolds. Driving Line suggests a 2013 or later truck for daily use. A cheap 3.8 can still make a good trail rig if you accept its limits.

SOURCE · DRIVING LINE · QUADRATEC
How much can a JK Unlimited tow?

3,500 lb, with a 350-lb tongue weight for the 2017 Rubicon. That's against 2,000 lb for the two-door. For heavy towing the factory manual calls for synthetic 75W-140 in the rear axle.

SOURCE · QUADRATEC · CARS.COM
What's the payload?

Less than you think. Quadratec lists 1,067–1,301 lb for 2012 four-doors depending on trim. For 2017, KBB lists 880–1,000 lb and Cars.com gives the Rubicon 1,178 lb against a 5,700-lb GVWR. Your door-jamb sticker is the number that counts, and a fully built overland JKU often exceeds it.

SOURCE · QUADRATEC · KBB · CARS.COM
What fuel economy should I expect?

The EPA rated the 2017 Unlimited 3.6 at 16 mpg city and 20 highway with the automatic (16/21 manual), and KBB lists a 22.5-gallon tank. Bigger tires, a lift and a rack all bring that down.

SOURCE · EPA (FUELECONOMY.GOV) · KBB
What oil does it take?

3.6 Pentastar: six quarts of 5W-20 meeting Chrysler MS-6395, or 5W-30 in hot climates. The filter is a cartridge under a cap on top of the engine, and Quadratec notes the filter changed for 2014, so buy for your year. The 3.8 also takes about six quarts with the filter, in 5W-20 or 5W-30; check the oil filler cap.

SOURCE · QUADRATEC · JK-FORUM
Which Unlimiteds have lockers?

Every Rubicon has electric Tru-Lok lockers front and rear. Per Wikipedia, a rear locker was optional on X and Sahara for 2007, then only on select X models for 2008–2009; later the only non-Rubicon options were the 2015 Wrangler X and the 2016 75th Anniversary Edition. A Trac-Lok limited slip was the usual non-Rubicon option.

SOURCE · WIKIPEDIA
Will the Dana 30 front axle handle 35s?

Driving Line rates the non-Rubicon Dana 30 at about 35-inch tires. The tubes and C-ends can bend with big tires or hard use, and that's true of the Rubicon's Dana 44 too. Trusses help prevent it; replacement housings from Dynatrac or Currie are the cure.

SOURCE · DRIVING LINE
What do I do if it gets death wobble?

Grip the wheel, don't brake hard, and slow down smoothly until it stops. Then fix the cause: start with the track bar, then the tie-rod ends, drag link, ball joints, control-arm bushings and wheel bearings, and check tire balance. A new steering stabilizer only masks it, and an alignment comes last.

SOURCE · QUADRATEC · EXTREMETERRAIN
What's the Pentastar cylinder-head issue?

In June 2014 Chrysler extended the warranty on the left cylinder head of some 2011–2013 3.6 V6s (2012–2013 on the Wrangler) to 10 years or 150,000 miles after cylinder-leakage misfires. Dealers replaced the head where testing showed excessive leakage, and AutoGuide reported that redesigned heads went into production in 2012. The extension has now run out, so a 2012–2013 truck with a misfire on that bank deserves a careful look.

SOURCE · AUTOGUIDE · CHRYSLER TSB 09-002-14
Is the four-door worse off-road than the two-door?

On tight, technical trails the 116-inch wheelbase gives up breakover angle and turning circle compared with the 95.4-inch two-door. Everywhere else it rides better and carries more. Driving Line says the two are mechanically nearly identical and recommends driving both before you choose.

SOURCE · DRIVING LINE · WIKIPEDIA
PART 05

Building one

Who makes the good stuff, where owners gather, and who to watch.

Common modifications & who does them

SUSPENSION LIFT2.5–3.5 inches with matched coils and shocks clears 35s and can be specced for a loaded overland truck. Correct the track-bar and control-arm geometry, or death wobble will remind you.
AEV — DualSport suspension ↗Teraflex ↗MetalCloak ↗ExtremeTerrain — JK lift kits ↗
STEERING & TRACK BARSHeavier tie rods, drag links and adjustable track bars keep big tires pointed where you want them and keep the front end tight.
Synergy Manufacturing ↗JKS Manufacturing ↗Teraflex Monster HD front adjustable track bar (Quadratec) ↗
AXLES & GEARSRegear after going to 35s, especially on 3.8 trucks. Then truss the front, or replace it with something stronger.
Dynatrac ↗Yukon ring and pinion kit, JK Dana 30 front (Quadratec) ↗ExtremeTerrain — JK ring and pinion gears ↗
ROCK SLIDERS & ARMORThe long wheelbase makes the rockers the first thing to hit on a ledge.
DV8 Offroad SRSOTB-06 rock slider steps, JK Unlimited (Quadratec) ↗GenRight ↗Poison Spyder ↗ExtremeTerrain — JK rocker armor ↗
ROOF RACKS & STORAGEThe four-door roof is long enough for a proper platform, so you can keep weight off the tailgate. Mind the payload.
Rhino-Rack Pioneer platform with Maximus-3 brackets, JK Unlimited (Quadratec) ↗Go Rhino overhead overland rack, JK Unlimited (Quadratec) ↗ExtremeTerrain — JK racks and storage ↗
SNORKELThe stock intake draws from the fender. A snorkel lifts it above the dust and spray.
Injen EVO15070 side-mount snorkel, JK (Quadratec) ↗ExtremeTerrain — JK snorkels ↗
BUMPERS & RECOVERYA winch-ready steel front bumper is the usual first armor buy. Count its weight against the payload.
ARB USA ↗Rock Krawler ↗ExtremeTerrain — JK bumpers and towing ↗

Clubs & events

EVENT Easter Jeep Safari ↗Red Rock 4-Wheelers' nine-day trail week in Moab, Utah; the 2027 edition runs March 20–28.EVENT Jeep Beach ↗Daytona Beach, Florida; bills itself as the world's largest Jeep-only event; 2027 dates April 16–25.EVENT Jeep Jamboree USA ↗Guided Jeep trail weekends across the US, including an annual Rubicon Trail trip.
Resources

Channels, accounts & forums

All Jeep resources →
YouTube channels
YTQuadratecJK HOW-TOS & INSTALLSYTExtremeTerrainWRANGLER INSTALLS & REVIEWSYTThrill of the GrilleJK/JKU HOW-TOSYTJK Gear and GadgetsJKU BUILD SERIES
Instagram accounts
IG@quadratecJEEP PARTS & BUILDSIG@extremeterrainWRANGLER PARTS & BUILDS
Forums & message boards
JK-Forum — Stock JK Tech ↗Fluids, fitment and factory-parts questions, including the tire-size threads.JK-Forum — Modified JK Tech ↗Lifts, axles, gearing and death-wobble troubleshooting.WranglerForum ↗Big general Wrangler board covering every generation.Expedition Portal ↗Overland builds, payload arguments and long-distance JKU trips.JeepForum ↗Long-running all-Jeep forum with JK sections.
SourcesWikipedia — Jeep Wrangler (JK)Driving Line — Jeep Wrangler JK Buyer's Guide (Ali Mansour, 2016)Quadratec — 2007 Jeep Wrangler JK SpecsQuadratec — 2012 Jeep Wrangler JK SpecsKelley Blue Book — 2017 Jeep Wrangler Unlimited specsCars.com — 2017 Jeep Wrangler Unlimited Rubicon specsOwner's-manual specification reprint — 2017 Jeep Wrangler JK fluids and capacitiesJK-Forum — JK Lube & Capacity Info (2007 3.8L)Quadratec — How To Do an Oil Change on a 2012–2018 Jeep Wrangler JK 3.6L PentastarCurbside Classic — Replacing the oil cooler/filter housing on the Pentastar 3.6L V6 (2015 JK)AutoGuide — Chrysler Pentastar V6 Engine Gets Extended Warranty (June 2014)ExtremeTerrain — Jeep Death Wobble: Explanations & FixesQuadratec — Jeep Death Wobble Q&A: Causes, Symptoms, Fixes and How to Prevent ItJK-Forum — Stock ride height, 33" tiresJK-Forum — Wheeling 33s on stock suspensionJK-Forum — What size tires can I put on a stock JeepExtremeTerrain — Ultimate Tire Size Guide for Jeep WranglersExpedition Portal — Ways to Increase the Jeep JK PayloadKelley Blue Book — 2014 Jeep Wrangler maintenance scheduleExtremeTerrain — Wrangler JK fluid capacitiesNorthridge4x4 — JK/JL bolt sizes and torque quick-reference chartfueleconomy.gov — 2017 Jeep Wrangler Unlimited 4WD 3.6 automatic (EPA 16/20 mpg)Chrysler — Service Bulletin 09-002-14 Rev. A, 3.6L left cylinder head (X56) (NHTSA-hosted)AutoGuide — Chrysler Pentastar V6 subject to cylinder head failure (2012)NHTSA — recalls API (campaign records for Jeep Wrangler 2007–2026)Wikipedia — Jeep Wrangler (JK)Wikipedia — Jeep Wrangler (US/Canada sales table)Bring a Trailer — Jeep Wrangler JK (2007–2018) resultsNorthridge4x4 — Jeep quick reference chart (lug thread and torque)ExtremeTerrain — Jeep wheel specifications tech guideExtremeTerrain — Wrangler JK exterior torque specsJEGS — Biggest tires for a Jeep Wrangler JKDriving Line — Tested: 35s with no lift on the Jeep Wrangler JKQuadratec — 2007 Jeep Wrangler JK specsQuadratec — 2007–2011 Wrangler JK Unlimited manufacturer specificationsCJ Pony Parts — How much can Jeep Wranglers tow?Fox News — Chrysler addresses Jeep 'death wobble' with technical service bulletin (Aug 2012)FCA US — Service Bulletin 02-001-16, shimmy with 4-inch Mopar lift (NHTSA-hosted)Chrysler — Service Bulletin 09-002-14 Rev. A, 3.6L left cylinder head (X56) (NHTSA-hosted)Chrysler — Warranty Bulletin D-14-12, X56 extended warranty (NHTSA-hosted)CarComplaints — TSB list, 2012 Jeep WranglerMopar — Jeep owner's manualsTechAuthority (FCA US) — printed owner's manualsRed Rock 4-Wheelers — Easter Jeep SafariJeep Beach — Daytona Beach, FloridaJeep Jamboree USA — 29th Rubicon Trail 2026fueleconomy.gov — 2017 Jeep Wrangler Unlimited 4WD 3.6 automaticQuadratec — What are the differences in off-roading a Wrangler TJ, JK and JL