A silver two-door Jeep Wrangler JK with a 'JK' fender decal on a wet, slushy road through a misty, snowy pine forest

JEEP WRANGLER · JK 2-DOOR · 2007–2018

Jeep Wrangler JK (2-door)

JK3.8 EGH V6 (2007–11)3.6 PENTASTAR V6 (2012–18)95.4 IN WHEELBASERUBICON: DANA 44s + E-LOCKERS

“The JK took the Wrangler from a summer toy to a computer-controlled, power-windowed mainstream hit, and the two-door is the version that kept the old-school wheelbase. Buy a 2012-on Pentastar unless you enjoy merging slowly. Then check the ball joints, because JK ones wear quickly.”

PART 01

Overview

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

The story

In January 2006, Chrysler group CEO Tom LaSorda drove a new Wrangler up a flight of steps and through a plate-glass window at the Detroit auto show. The JK was a clean-sheet redesign from the DaimlerChrysler years. It was wider than the TJ by 3.4 inches of track and had 2 inches more wheelbase, yet it was 2.5 inches shorter overall. It also ran almost everything except the steering through computers, a first for a Wrangler. Purists grumbled. Then it went on to set new Wrangler sales records anyway.

BIGGER, WIDER, WIRED

Mark Moushegian's design won an internal competition by 2003 and was frozen in January 2004. The JK kept the things that make a Wrangler a Wrangler: a separate body and frame, live axles front and rear on coils, a fold-flat windshield, removable doors and part-time four-wheel drive. Around them came stability control, off-road-tuned ABS and traction control acting as an electronic limited slip. It also got power windows and locks, available navigation and, on the Rubicon, an electronic front sway-bar disconnect. With the factory 32-inch tires, the two-door Rubicon is quoted at a 44.3-degree approach and a 40.4-degree departure.

The four-door JK Unlimited arrived at the same time and stole the show. By mid-2017, Autotrader counted three-quarters of new Wranglers for sale as four-doors. The two-door kept the 95.4-inch wheelbase that Quadratec calls 'still nimble, just slightly longer' than a TJ, which is why trail regulars still seek it out.

THE MINIVAN ENGINE, THEN THE PENTASTAR

From 2007 to 2011 the JK used the 3.8-liter EGH V6, the same pushrod engine as Chrysler's minivans and the Pacifica. It made 202 hp and 237 lb-ft by Jeep's 2008 figures, and it came with the six-speed NSG370 manual or the 42RLE four-speed automatic. It was adequate in the way a tent is adequate housing. The 2011 model year brought a fully redesigned interior, with a new dash, steering-wheel controls, available heated leather and Bluetooth.

For 2012 the 3.6-liter Pentastar replaced it, with 285 hp and 260 lb-ft, and Mercedes' five-speed W5A580 automatic replaced the 42RLE. Quadratec says the change meant the Wrangler 'is no longer the rolling brick it was'. The early Pentastar had a teething problem: Chrysler replaced faulty left cylinder heads (excessive cylinder leakage, showing up as misfires) on some 2012–13 engines and extended their warranty to 10 years or 150,000 miles. Diesel JKs, using VM Motori's 2.8, were sold outside the US only.

RUBICONS, MOABS AND WILLYS WHEELERS

Every Rubicon has Dana 44 axles at both ends with electric lockers, the Rock-Trac NV241 transfer case with a 4:1 low range, 4.10 gears, rock rails and the sway-bar disconnect. Sport and Sahara models used a Dana 30 front, a Dana 44 rear (Quadratec says fewer than a thousand early 2007s got a Dana 35) and the 2.72:1 Command-Trac. A rear locker on a non-Rubicon was a rare option.

The special editions came thick and fast. The 2012 Call of Duty: MW3 edition wore AEV bumpers and a sculpted hood. The 2013 Moab brought AEV-style steel bumpers and sliders but kept the 2.72:1 transfer case. The 2013 10th Anniversary Rubicon was the edition chosen for the one-millionth JK, built on May 17, 2013. The 2014 Rubicon X added steel bumpers and a Power Dome hood. For 2015 the lineup included the Willys Wheeler and the Rubicon Hard Rock.

HOW IT ENDED

For 2018 the JK was built alongside the new JL at Toledo, with a 'Wrangler JK' fender decal to tell them apart, and a final Golden Eagle edition. The last one rolled off the line on April 27, 2018, and its plant was retooled to build the Gladiator pickup. The JK is the Wrangler that made the aftermarket explode: Mopar alone offered more than 250 accessories for the 2012 model. That's why a used JK today is rarely stock, and why you should inspect what the last owner bolted on as carefully as what Jeep did.

SIDEBAR · DEATH WOBBLE GOES TO COURT

The shake that launched a lawsuit

Any solid-front-axle Jeep can get 'death wobble': a violent oscillation of the front axle and steering, usually triggered by a bump at 45–65 mph. Heavier tires, lifts and worn parts made the JK notorious for it. Quadratec reports that a New Jersey owner sued FCA seeking class-action status for 2015–2018 Wranglers, saying the dealer had replaced her steering stabilizer three times in six months without curing it.

FCA's position was that any vehicle with a solid axle can experience steering vibration, and that it is routinely corrected. NHTSA said it had never issued a recall for death wobble, and Chrysler's 2012 service bulletin only reminded owners to keep their steering systems in good condition. The real fix is mechanical: find the play in the track bar, tie rods, ball joints or bearings, and remove it.

A dark green two-door Wrangler JK Willys Wheeler parked at a lakeside campsite beside a tent, with Lake Mead and desert mountains behind — JK WILLYS WHEELER · LAKE MEAD CAMP

A silver two-door Wrangler JK with a whip flag nosed into the face of a sand dune in the Liwa desert — JK 2-DOOR · LIWA DESERT DUNES

Year by year

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

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.
2009Hill Start Assist standard; Trailer Sway Control available
2010Easier-folding soft top; Uconnect on MyGig-equipped trucks
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.
20123.6 Pentastar V6 (285 hp, 260 lb-ft) and 5-speed W5A580 automatic replace the 3.8 and the 4-speedSweet spot
2012–13Some Pentastars have faulty left cylinder heads (misfire codes); covered by the X56 extension to 10 years/150,000 miles
2013Second windshield-washer nozzle returns; one-handed rear-seat fold; Moab edition with AEV bumpers. The millionth JK is built in May 2013.
2014Clear park and turn lamps; optional 6.5 in Uconnect; Rubicon X edition
2015Willys Wheeler and Rubicon Hard Rock join the range; Torx tool kit for doors and windshield standard; Alpine audio optionSweet spot
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 has a ladder frame with coil-sprung live axles at both ends, each located by four links and a track bar, and recirculating-ball steering with a damper. The drivetrain is a part-time two-speed transfer case with no center differential. Standard models get a Dana 30 front and Dana 44 rear. Rubicons get Dana 44s at both ends with electric lockers, a 4:1 Rock-Trac and an electronic front sway-bar disconnect. Nearly every system is electronically controlled.

CHASSISLadder frame, 95.4 in wheelbase2 in longer than the TJ, with 3.4 in more track. 61.9 in track front and rear on 2007–11 trucks.

ENGINE 2007–113.8 L EGH OHV V6202 hp / 237 lb-ft (Jeep, 2008). Shared with Chrysler minivans. 6 qt of 5W-20.

ENGINE 2012–183.6 L Pentastar DOHC V6285 hp / 260 lb-ft. Coil-on-plug ignition. The plastic oil filter housing sits in the engine valley.

TRANSMISSIONSNSG370 6-spd manual · 42RLE 4-spd (2007–11) · W5A580 5-spd (2012–18)The W5A580 is Mercedes' NAG1 family. Both automatics use ATF+4.

TRANSFER CASENV241 Command-Trac 2.72:1 · Rock-Trac 4:1 (Rubicon)Part-time, no center differential.

AXLESDana 30 / Dana 44 · Rubicon Dana 44 / Dana 44 with Tru-Lok e-lockersRubicons use 4.10 gears. Fewer than a thousand 2007s had a Dana 35 rear.

Variants & engines

YEARS	PLATFORM	ENGINE	OUTPUT	WORTH KNOWING
2007–2010	JK 2-door (X/Sport, Sahara, Rubicon)	3.8 L EGH V6	202 hp / 237 lb-ft	NSG370 six-speed or 42RLE four-speed. Hill Start Assist from 2009; easier-folding soft top in 2010.
2011	JK 2-door	3.8 L EGH V6	202 hp / 237 lb-ft	New interior: dash, steering-wheel controls, available heated leather. Last year of the 3.8 and 42RLE.
2012–2018	JK 2-door	3.6 L Pentastar V6	285 hp / 260 lb-ft	W5A580 five-speed auto or NSG370. EPA 17/21 mpg (2012 2-door). Revised oil filter housing from 2014.
2012–2013	Pentastar early engines	3.6 L Pentastar V6	—	Some left cylinder heads failed (misfire codes); warranty extended to 10 years/150,000 miles.
2007–2018	Rubicon (incl. 10th Anniversary, Rubicon X, Hard Rock)	3.8 then 3.6	As above	Dana 44s front and rear, e-lockers, 4:1 Rock-Trac, 4.10 gears, sway-bar disconnect, LT255/75R17 BFG KM.
2007–2018 (ex-US)	JK 2.8 CRD	VM Motori 2.8 L turbo-diesel I4	177 hp / 302 lb-ft, later 197 hp	Never sold in the US.

Capability numbers

Towing2,000 lb (907 kg)

Payload1,000 lb (454 kg)2007 spec

Fuel tank18.6 gal (70 L)

Ground clearance8.8–10.2 in (224–259 mm)X to Rubicon, 2007 spec

Approach / departure / breakover44.3° / 40.4° / 25.4°Rubicon on 32 in tires

Fuel economyEPA 17 city / 21 hwy2012 two-door, 3.6 Pentastar

Curb weight3,760–4,104 lb (1,706–1,862 kg)2007 X to Rubicon

Wheelbase95.4 in (2,423 mm)

Wheels & tires

FACTORY TIRES

225/75R16 or 245/75R16 (X/Sport)255/75R17 (Sport S, Sahara and most special editions)255/70R18 (Sahara option, 70th Anniversary)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]

LIFT	BIGGEST TIRE	WHAT IT TAKES
Stock	33 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 in	35x12.50 or 285/75R17	285/75R17 works on factory 17s; 35x12.50 wants 18x9 or 20x9 wheels at about 0 to +1 mm offset.
3.5 in	37 in	JEGS 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

Built in Toledo, Ohio, from August 2006 to April 27, 2018; its plant was then retooled for the Gladiator.

ProductionAugust 2006 – April 27, 2018 (Toledo, Ohio)

MilestoneThe millionth JK (two- and four-door) was built on May 17, 2013: a 10th Anniversary Rubicon

US Wrangler sales, 2007–20171,560,169 (all body styles, calendar years)

Body mixBy mid-2017, three-quarters of new Wranglers listed for sale were four-doors

Islander2010Sport-based two-door with Islander seats and blue-accented wheel

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

JKs are firmly in used-truck territory. Low miles, Rubicon hardware and a manual gearbox earn the premiums, and tidy late Pentastar trucks outsell early 3.8s.

Project / high-mile$6k–12k

Driver$12k–20k

Excellent / low-mile Rubicon$20k–33k

Based on 70 two-door JK sales on Bring a Trailer in 2025–26: median about $15.8k, top sale $32,750 for a one-owner, 5k-mile 2015 Rubicon 6-speed. Prices move; checked October 2026. See live listings below.

What to check before you buy

01
Which engine? Check the VIN year2007–11 trucks have the 3.8 and the four-speed automatic; 2012-on trucks have the Pentastar and the five-speed. The Pentastar is the one most buyers want. On a 2012–13, ask whether the left cylinder head was ever replaced: Chrysler extended coverage on affected heads to 10 years or 150,000 miles, which has run out on most of them by now.
02
Look into the engine valley (2012–18)Quadratec says the Pentastar's plastic oil filter housing 'has a bad habit of cracking'. Look for oil pooled under the intake plenum, a burning-oil smell or slow oil loss. Because the housing contains the oil cooler, coolant can leak there too. Many owners fit an aluminum housing.
03
Jack up the front axleJK ball joints often wear surprisingly quickly, especially with 35s, bumpers and winches. Check for vertical wheel play, steering looseness, uneven tire wear and highway wander. Then drive it at 45–65 mph over bumps to rule out death wobble.
04
Listen at cold startA tick-tick-tick that fades as the engine warms is usually snapped rear exhaust manifold bolts, which Quadratec calls notorious on both the 3.8 and the 3.6. It isn't urgent, but it's a negotiating point.
05
Electrical gremlins and waterJK electrical faults often trace to the TIPM (Totally Integrated Power Module) or a failing clockspring. Symptoms include airbag lights, dead steering-wheel controls, fuel-pump problems and wipers with a mind of their own. Water in the cabin makes them worse, so lift the carpets and look for damp.
06
Inspect the front axle C's on modified trucksOn 35-inch tires or bigger, hard use can bend the Dana 30's C-shaped knuckle ends where the ball joints sit. Look for odd camber, strange tire wear and whether gusset plates or a truss are already fitted.
07
Prove the Rubicon hardware worksEngage both lockers and the sway-bar disconnect, and confirm 4-Low is the 4:1 Rock-Trac. A Moab or Willys Wheeler looks the part but has the 2.72:1 transfer case, and lockers were optional at best.
08
Read the lift like a résuméMost JKs are modified. A quality lift should include a correct track bar, geometry correction and an alignment. Cheap spacer lifts with 35s are where worn joints and death wobble come from.

Spotting the real thing

Twelve years of near-identical bodies, heaps of sticker-pack special editions and plenty of Hemi swaps mean the badge on the hood is only a starting point.

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.
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 (its 2007 spec table lists the Dana 35 for the X). 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.
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.
ID
Moab and Rubicon XThe 2013 Moab has AEV-style bumpers and hood but keeps the 2.72:1 transfer case. The 2014 Rubicon X keeps the full Rubicon drivetrain and adds steel bumpers and a Power Dome hood.
ID
2018 JK vs JL2018 JKs sold alongside the new JL carry a 'Wrangler JK' decal on the front fenders.

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 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. See also 11V-528 and 13V-176 (2008–2012 RHD) and 24V-196 (2016 RHD).

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 3.8 V6

AutoTempest ↗Bring a Trailer ↗

2012–2018 · USJK 3.6 Pentastar

AutoTempest ↗Bring a Trailer ↗

2007–2018 · USAll JK 2-door

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

Most JKs have been lifted, re-tired or wheeled, so baseline the drivetrain fluids and the front end first. On a 2012–18 Pentastar, look into the engine valley for oil-filter-housing leaks before you do anything else. Buy by engine and year: the filter, plugs, thermostat housing and coolant type all changed during the run.

Engine oil & filter5W-20 meeting MS-6395 · 6 qt (3.8 and 3.6)Jeep: 8,000 mi or 6 months on the Pentastar, never over 10,000; sooner for severe use

The Pentastar's cartridge filter lives in the top-mounted housing (24 mm cap; don't yank the filter or you can break the pressure-relief valve). The filter changed for 2014.

Parts

OMIX 17436.42 air, oil and cabin filter kit, 2014–18 JK 3.6Quadratec ↗ · Amazon ↗

Mopar 68191350AA oil filter cap, 2014–18 JK 3.6Quadratec ↗ · Amazon ↗

Oil filter housing inspection (2012–18)Plastic housing/cooler in the engine valleyNow, and with a flashlight at every oil change

Oil or coolant pooled under the plenum means it's time for the aluminum upgrade.

Parts

Mishimoto aluminum oil filter housing kit, 2014–17 JKExtremeTerrain ↗ · Amazon ↗

OMIX 17436.52 oil filter housing assembly, 2012–13 JKQuadratec ↗ · Amazon ↗

Engine air & cabin filtersFactory airbox element and cabin filterInspect at every oil change; replace when dirty

Dusty trail use clogs the air filter fast.

Parts

JK cabin air filtersQuadratec ↗ · Amazon ↗

Spark plugs3.8: Champion RE14PLP5, 0.050 in, 12 lb-ft per ExtremeTerrain [CONFIRM IN MANUAL] · 3.6: Champion RER8ZWYCB4, 0.043 in, 13 lb-ftExtremeTerrain quotes Chrysler's 102,000 mi [CONFIRM IN MANUAL]; inspect at 60,000 on modified or trail trucks

The 3.8 uses plug wires; the 3.6 is coil-on-plug.

Parts

Mopar SP149125AF spark plug, 3.6Quadratec ↗ · Amazon ↗

Crown S2RE14PLP5 spark plug, 3.8Quadratec ↗ · Amazon ↗

Coolant & thermostat3.8 and 2012 3.6: HOAT, ≈13 qt · 2013-on 3.6: OAT 10-yr/150k, 10.5 qtFlush now if there's no record, then per the coolant's life

Don't mix HOAT and OAT; check which one is in the tank before topping up.

Parts

Mopar 68163849AB pre-diluted OAT coolant, 2013-onQuadratec ↗ · Amazon ↗

Crown 68210220AA thermostat, 2007–11 JK 3.8Quadratec ↗ · Amazon ↗

OMIX 17118.07 thermostat housing, 2012–18 JK 3.6Quadratec ↗ · Amazon ↗

Automatic transmissionATF+4 · 42RLE: 4 qt service fill · W5A580 (NAG1): 5.3 qt service fillDrain and refill (with a filter) now if there's no record

A service fill only changes part of the fluid; do it twice rather than flushing.

Parts

Mopar 52108325AA transmission filter, 2012–18 JKQuadratec ↗ · Amazon ↗

ATF+4 (search)Quadratec ↗

Manual transmission (NSG370)Mopar Manual Transmission Lubricant · 1.6 qtChange now if there's no record

The clutch hydraulics use DOT 3 brake fluid; check the clutch master level.

Parts

Mopar manual transmission lubricant (search)Quadratec ↗

Search manual transmission (nsg370) for the Jeep Wrangler JK (2-door)Amazon ↗

Transfer case (NV241)ATF+4 · 2.1 qtChange now

Same fluid for Command-Trac and Rock-Trac.

Parts

ATF+4 (search)Quadratec ↗

Search transfer case (nv241) for the Jeep Wrangler JK (2-door)Amazon ↗

Front & rear differentials80W-90 (75W-140 for towing) · Dana 30: 2.1 pt · Dana 44 front: 2.7 pt · Dana 44 rear: 4.75 pt · Trac-Lok: add 4 oz limited-slip additiveNow, and every 15,000 mi with heavy use or after deep water (ExtremeTerrain)

You can check JK diff levels without pulling the cover.

Parts

Gear oil 80W-90 (search)Quadratec ↗

Limited slip additive (search)Quadratec ↗

Search front & rear differentials for the Jeep Wrangler JK (2-door)Amazon ↗

Driveshaft U-joints1350-series jointsInspect now; grease if greasable

Lifted JKs chew through rear driveshaft joints. Check for play by hand.

Parts

Yukon YUJ7166 1350 U-joint, 2007–18 JKQuadratec ↗ · Amazon ↗

Dana Spicer SPL30-1350XC driveshaft U-joint, 2012-on JKQuadratec ↗ · Amazon ↗

Front-end inspectionTrack bar, tie rods, drag link, ball joints, unit bearingsNow, and after every lift install or hard trail day

Re-torque the hardware and align. This is your death-wobble insurance.

Parts

Dana Spicer 10073372 ball joint kitQuadratec ↗ · Amazon ↗

JK tie-rod endsQuadratec ↗ · Amazon ↗

Power steering fluidPower Steering Fluid +4 (ATF+4 acceptable)Check level and condition now

Big tires work the steering box and pump hard.

Parts

Mopar power steering fluid (search)Quadratec ↗

Search power steering fluid for the Jeep Wrangler JK (2-door)Amazon ↗

Brake fluidDOT 3Flush now, then every 2–3 years [CONFIRM IN MANUAL]

The same reservoir type also feeds the clutch on manual trucks.

Parts

Mopar 4318080AD DOT 3 brake fluidQuadratec ↗ · 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.

Replace the Pentastar oil filter housing (2012–18)

DIFFICULTY · 3 / 5TIME · About 6 hours in one owner's write-up, including prepSHOP COST · Housing plus gaskets; under $30 in special tools for the Curbside Classic author

SYMPTOMSOil (and sometimes coolant) pooling in the valley between the cylinder banks, a burning smell, slow oil loss. You often won't see drips on the ground until the leak is bad.

THE FIXRemove the engine cover and intake duct. Unplug the intake connectors (the MAP sensor's red tab first), the vacuum hoses and the throttle-body brackets, then remove the seven captive 8 mm bolts and lift off the upper intake. Unplug the injectors and right-bank coils, vacuum away debris, plug the ports, and remove the eight lower-intake bolts, supporting the manifold out of the way. Unplug the oil and coolant sensors and the coolant hose, then remove the five E8 Torx bolts and lift out the housing. On the bench, move the cooler and sensors (with thread sealant) to the new housing. Fit new gaskets and O-rings and bolt it down in the specified sequence. The filter cap is 18 lb-ft. Reassemble, change the oil (6 qt of 5W-20) and check for leaks. 2014-on housings differ from 2012–13, so buy for your year.

TOOLS & PARTS27 mm and 19 mm deep sockets · E8 external Torx · 24 mm cap socket · inch-pound torque wrench · 8, 10 and 13 mm sockets · magnet and pick · shop vac.

WHERE TO BUY PARTSDorman 926-959 aluminum oil filter housing with cooler, 2012-on 3.6 JK · ExtremeTerrain ↗Amazon ↗Mishimoto MMOFH-JK-12 aluminum oil filter housing kit, 2014–17 JK · ExtremeTerrain ↗Amazon ↗Mopar 68596317AB oil filter and cooler adapter, 2014–16 JK · Quadratec ↗Amazon ↗Crown Automotive 5184294RK oil filter adapter repair kit, 2012–13 JK · Quadratec ↗Amazon ↗

Cure death wobble: track bar, tie rods and steering

DIFFICULTY · 2 / 5TIME · An afternoon to diagnoseSHOP COST · Often a track-bar bushing or end, tie-rod ends or a drag link, plus an alignment

SYMPTOMSViolent side-to-side shaking of the front end after a bump at 45–65 mph that won't stop until you slow right down.

THE FIXStart with the front track bar. With the Jeep on the ground, have a helper turn the wheel about a quarter turn each way while you watch the track-bar ends and bracket holes; any movement is a fault. Then check the tie-rod ends, drag link, ball joints, control-arm bushings, wheel bearings, and tire balance and pressure. Quadratec says a stabilizer 'rarely fixes the root cause'. Replace the worn parts, torque all front-end hardware to spec (Northridge4x4's chart gives 125 ft-lb for both front track-bar bolts and 63 ft-lb for the tie-rod end nuts; confirm against the factory manual), and finish with a proper alignment. On lifted trucks, a correctly sized adjustable track bar re-centers the axle.

TOOLS & PARTSHelper · pry bar · torque wrench · sockets · tape measure.

WHERE TO BUY PARTSRancho RS62115 front adjustable track bar, 2007–18 JK · Quadratec ↗Amazon ↗Rough Country 1118 front track-bar bracket, 2007–18 JK · Quadratec ↗Amazon ↗TeraFlex 1344410 HD steering ball joint (tie rod or drag link), JK · Quadratec ↗Amazon ↗Fox 2.0 Performance Series steering stabilizer, 2007–18 JK · Quadratec ↗Amazon ↗

Press in new ball joints

DIFFICULTY · 4 / 5TIME · A day for both sidesSHOP COST · Ball joint set plus a rented ball-joint press

SYMPTOMSVertical play at the top and bottom of the tire, wandering, uneven tire wear, and wobble after bumps. Quadratec says factory JK ball joints 'often wear surprisingly quickly', especially on heavy, lifted trucks.

THE FIXSupport the truck on stands and remove the wheel, caliper, rotor and unit bearing to free the axle shaft. Separate the tie rod and drag link, remove the knuckle, then press the old upper and lower joints out of the axle C. Inspect the C for bends and cracks at the same time. Press in the new joints with the correct adapters, refit the knuckle and torque the castle nuts to spec (Northridge4x4 lists 75 ft-lb for the upper and lower ball-joint nuts). Finish with an alignment. Adjustable or heavy-duty kits are worth it on 35s.

TOOLS & PARTSBall-joint press and JK adapter set · pickle fork or tie-rod puller · large sockets · torque wrench · new cotter pins.

WHERE TO BUY PARTSDana Spicer 10073372 performance ball joint kit, 2007–18 JK · Quadratec ↗Amazon ↗Yukon ball joint set, 2007–18 JK · Quadratec ↗Amazon ↗Synergy HD adjustable ball joint kit, JK · Quadratec ↗Amazon ↗

Replace a front unit bearing

DIFFICULTY · 2 / 5TIME · A couple of hours per sideSHOP COST · One hub and bearing assembly

SYMPTOMSPlay when you rock the tire with the truck in the air, a growl that changes with steering, and, as part of the death-wobble checklist, looseness in the front end.

THE FIXSupport the axle and remove the wheel, then the caliper (hang it, don't let it hang from the hose) and rotor. Remove the axle-shaft nut, then the bolts holding the unit bearing to the knuckle from behind, and tap the hub free. Clean the knuckle bore, anti-seize it, fit the new hub, and torque the bolts and axle nut to the factory spec (Northridge4x4 lists 75 ft-lb for the hub bolts and 100 ft-lb for the 35 mm axle nut). Mopar lists different hubs for 2007–10 and 2011–18 trucks, so buy by year.

TOOLS & PARTSLarge axle-nut socket · breaker bar · torque wrench · anti-seize · hammer.

WHERE TO BUY PARTSMopar 52060398AE hub and bearing, 2011–18 JK · Quadratec ↗Amazon ↗Yukon unit bearing, 2007–11 JK (Dana 30 or Dana 44 front) · Quadratec ↗Amazon ↗

Fix a ticking exhaust manifold (broken bolts)

DIFFICULTY · 3 / 5TIME · Half a day to a day, depending on how the bolts come outSHOP COST · Gaskets and hardware; more if a broken bolt has to be drilled out

SYMPTOMSA tick-tick-tick on cold start that quiets as the engine warms, from a leak at the rear of a manifold. Quadratec says the rear manifold bolts on both the 3.8 and 3.6 are 'notorious for snapping'.

THE FIXFind the leak with the engine cold (a manifold that's black at the flange or a snapped bolt head is the giveaway). Penetrating oil the studs for a day or two. Unbolt the downpipe and remove the manifold. Extract broken bolts by drilling and using an extractor, or by welding a nut onto the stub. Chase the threads, fit new hardware and gaskets, torque to spec and reconnect the exhaust.

TOOLS & PARTSPenetrating oil · sockets and extensions · left-hand drill bits and extractors (or a welder) · thread chaser · torque wrench.

WHERE TO BUY PARTSOMIX 17451.24 exhaust manifold gasket set, 2012–18 JK 3.6 · Quadratec ↗Amazon ↗Crown Automotive 68093232AA exhaust manifold gasket, 2012-on V6 · Quadratec ↗Amazon ↗OMIX 17626.02 exhaust manifold, 2007–11 JK 3.8 · Quadratec ↗Amazon ↗

Replace the clockspring

DIFFICULTY · 2 / 5TIME · An hour or twoSHOP COST · One clockspring

SYMPTOMSAirbag warning light, horn or steering-wheel buttons that don't work, and cruise or audio controls dropping out. Quadratec lists it with the TIPM as the usual JK electrical culprits. On 2007–10 trucks, check recall 16V-290 first: Chrysler recalled the clockspring because dust contamination could stop the driver's airbag from deploying.

THE FIXPoint the wheels straight ahead. Disconnect the battery and wait for the airbag system to discharge, as the factory manual specifies. Remove the airbag module and steering wheel, then the column shrouds. Unplug and remove the old clockspring and fit the new one centered, following its instructions (don't spin it). Reassemble, reconnect the battery and clear any codes. Quadratec Academy has a step-by-step JK video.

TOOLS & PARTSTorx and metric sockets · steering-wheel puller if it's stuck · trim tools · factory manual for the airbag procedure.

WHERE TO BUY PARTSMopar 05156106AG clockspring, 2007–18 JK · Quadratec ↗Amazon ↗Quadratec Academy — how to install a clockspring in a JK (video) · Quadratec ↗Amazon ↗

Change the spark plugs (and don't over-torque the Pentastar)

DIFFICULTY · 2 / 5TIME · An hour or twoSHOP COST · Six plugs

SYMPTOMSMisfires, rough idle and lost economy, or simply a truck past the interval. ExtremeTerrain quotes Chrysler's interval as 102,000 miles [CONFIRM IN MANUAL]. ExtremeTerrain suggests pulling one plug for inspection at 60,000 on modified, trail-used trucks.

THE FIXOn the 3.8, pull the wires by the boots. On the 3.6, unclip each coil-on-plug connector and remove the coil (typically one 10 mm bolt). Gap the new plugs at 0.050 in for the 3.8 (Champion RE14PLP5) or 0.043 in for the 3.6 (Champion RER8ZWYCB4). Torque them to 13 lb-ft (±2) on the 3.6. ExtremeTerrain gives 12 lb-ft for the 3.8 [CONFIRM IN MANUAL]. The Pentastar's 12 mm plugs in aluminum heads don't tolerate over-torquing. Add dielectric grease to the boots.

TOOLS & PARTS5/8 in spark plug socket · extensions · 3/8 in torque wrench · gap gauge · dielectric grease.

WHERE TO BUY PARTSMopar SP149125AF spark plug, 2012-on 3.6 JK · Quadratec ↗Amazon ↗Crown Automotive S2RE14PLP5 double-platinum plug, 2007–11 JK 3.8 · Quadratec ↗Amazon ↗

Gusset or truss a bent front axle

DIFFICULTY · 4 / 5TIME · A day (welding required)SHOP COST · Gusset/truss kit plus welding

SYMPTOMSCamber you can't align out, odd tire wear or changed steering on a JK running 35s or bigger. Quadratec warns that heavy tires and hard use can bend the axle C's where the ball joints sit.

THE FIXHave the axle checked first: a bent C needs straightening or a replacement housing before any gusset goes on. On a straight axle, strip the paint and coatings where the gussets and truss go and tack them in place. Weld in short alternating beads to limit heat distortion, then let it cool and coat it. Many owners do it with the axle out of the Jeep, along with the ball joints.

TOOLS & PARTSWelder · grinder · clamps · axle stands · rust-proof coating.

WHERE TO BUY PARTSRough Country 10565 Dana 30 axle truss & gusset kit, 2007–18 JK · Quadratec ↗Amazon ↗JK axle truss and protection · Quadratec ↗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

Jeep Wrangler JK (2-door) questions, answered

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

33 inches is the usual answer, with caveats. ExtremeTerrain says many JK owners fit 33s on a stock suspension, but fender rubbing will probably show up off-road at full flex, and width matters as much as height. On JK-Forum, owners of stock two-door Rubicons report 285/75R17s clearing on pavement, with rubbing on the control arms at full lock that adjusting the steering stops can cure. Not every wheel works: one owner couldn't fit 285/75R17s on AEV Pintlers without a lift. 255-width 33s are the safe bet; 35s need a lift.

SOURCE · EXTREMETERRAIN · JK-FORUM

3.8 or 3.6, which should I buy?

The 3.6 Pentastar (2012–18) makes 285 hp against the 3.8's 202, and comes with a five-speed automatic instead of a four-speed. Quadratec says the 2012 switch ended the JK's 'rolling brick' era. The 3.8 is simpler and cheaper to buy. On a Pentastar, budget for the oil filter housing.

SOURCE · WIKIPEDIA · QUADRATEC

What's the Pentastar cylinder head problem?

Some early 2012–13 Wrangler Pentastars had faulty left cylinder heads. Chrysler's bulletin describes excessive cylinder leakage showing up as misfire codes (P0300, P0302, P0304 or P0306); owners also reported a tick from the left bank. Chrysler replaced heads under warranty, fitted redesigned heads to new engines from 2012 (AutoGuide), and in 2014 extended coverage on affected heads to 10 years or 150,000 miles (Warranty Bulletin D-14-12, code X56).

SOURCE · AUTOGUIDE · CHRYSLER TSB 09-002-14

What causes death wobble and how do I fix it?

Looseness or wear in the front end, most often the track bar, tie-rod ends, ball joints, control-arm bushings or wheel bearings, usually set off by a tire imbalance or a bump at 45–65 mph. A stabilizer only masks it. Find and replace the worn part, torque the hardware and align the truck.

SOURCE · QUADRATEC

Is the Rubicon worth it over a Sport?

If you'll wheel it, yes. You get Dana 44s at both ends instead of a Dana 30 front, front and rear electric lockers, a 4:1 Rock-Trac instead of 2.72:1, 4.10 gears and the electronic sway-bar disconnect. Retrofitting all of that to a Sport is a big, expensive job. A Moab or Willys Wheeler looks the part but keeps the 2.72:1 transfer case.

SOURCE · WIKIPEDIA · QUADRATEC

How much can a 2-door JK tow?

2,000 lb, against 3,500 lb for the four-door Unlimited, per Quadratec's 2012 spec summary. Maximum payload is about 1,000 lb.

SOURCE · QUADRATEC

What fuel economy should I expect?

The EPA rated a 2012 Pentastar two-door at 17 mpg city and 21 highway. The tank holds 18.6 gallons. Lifts, 33–35 inch tires and steel bumpers cost several mpg.

SOURCE · WIKIPEDIA (EPA) · QUADRATEC

What fluids does it take?

Per ExtremeTerrain's JK chart: 3.8 and 3.6 engines take 6 qt of 5W-20. Coolant is HOAT for the 3.8 and 2012 3.6 (about 13 qt), and OAT for 2013-on 3.6s (10.5 qt). The 42RLE takes ATF+4 (4 qt service fill), the W5A580/NAG1 ATF+4 (5.3 qt service fill), and the NSG370 1.6 qt of Mopar Manual Transmission Lubricant. The NV241 takes 2.1 qt of ATF+4. The Dana 30 front takes 2.1 pints, the Dana 44 front 2.7 pints and the Dana 44 rear 4.75 pints of 80W-90, with 75W-140 recommended for towing. Trac-Lok rears need 4 oz of limited-slip additive.

SOURCE · EXTREMETERRAIN

How often should I change the oil?

Quadratec cites Jeep's 8,000 miles or six months for the Pentastar, and never more than 10,000. Severe use (towing, dust, off-road) shortens it. Mopar specifies oil meeting MS-6395. Note that the oil filter changed in 2014, so buy the right one.

SOURCE · QUADRATEC

Why does it tick at cold start?

Usually broken rear exhaust manifold bolts letting the manifold leak until it heats up and seals. It's very common on both the 3.8 and the 3.6.

SOURCE · QUADRATEC

What are the TIPM and clockspring problems?

The TIPM is the JK's central power-distribution module. With a failing clockspring, it's the usual source of airbag lights, dead steering-wheel controls, fuel-pump problems and wipers with a mind of their own. Water in the cabin makes it worse.

SOURCE · QUADRATEC

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 proper geometry (track bar, control arms or brackets) clears 35s without inviting death wobble.

AEV (American Expedition Vehicles) ↗MetalCloak ↗Quadratec — JK lift kits ↗

BALL JOINTS & STEERINGHeavy-duty ball joints, tie rods and a correctly sized track bar are the cure for a front end that wears out under big tires.

Dana Spicer performance ball joints (Quadratec) ↗Synergy Manufacturing HD ball joints (Quadratec) ↗

AXLE ARMORThe Dana 30 front is the weak link once you go to 35s. Gussets and a truss stop the C's bending.

Quadratec — JK axle truss & protection ↗

BUMPERS & WINCHSteel bumpers with a winch mount are the JK's signature mod; the Call of Duty and Moab editions came with AEV-style ones from the factory.

AEV ↗WARN ↗Quadratec — JK front bumpers ↗

ROCK SLIDERSThe factory rock rails on Rubicons are fine. Other trims have nothing to protect the sills.

Rock Hard 4x4 ↗Quadratec — JK rocker guards ↗

LOCKERSNon-Rubicon JKs rarely got a factory locker. Air lockers add front and rear.

ARB Air Locker ↗

ALUMINUM OIL FILTER HOUSINGThe permanent fix for the Pentastar's plastic housing.

Mishimoto MMOFH-JK-12 (ExtremeTerrain) ↗Dorman 926-959 (ExtremeTerrain) ↗