Specs, fluids & service · 1981–1986

Jeep CJ-8 Scrambler specs, fluids and service intervals

The numbers you need in the garage, on one page: spec sheet, capacities and service intervals, wheels and tires, and the parts to order. Sourced from owners, specialists and the factory; tags marked confirm in manual haven't been checked against a factory source yet.

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Spec sheet

MODEL YEARS	1981–1986 (launched March 1981)
BUILT	≈ 27,800 (8,355 in 1981 to 128 in 1986)
WHEELBASE	103.5 in (10 in longer than CJ-7)
ENGINES	GM 151 I4 · AMC 150 I4 · AMC 258 I6
OUTPUT	AMC 150: 105 hp · 258: 115 hp
MANUALS	SR-4, T-4, T-176 4-spd · T-5 5-spd
AUTOMATICS	TorqueFlite 904 (I4) · 999 (I6)
TRANSFER CASE	Dana 300, two-speed, gear-driven
AXLES	Dana 30 front · AMC 20 rear (some 1986 Dana 44)
PAYLOAD	636 kg (≈1,400 lb), per 4WDrive
PRICE NEW	$7,288 base (1981); $6,765 low (1982)
REPLACED BY	Jeep Comanche (pickup) · Wrangler YJ (open Jeep)

By year

YEARS	PLATFORM	ENGINE	OUTPUT	NOTES
1981	CJ-8 (launch)	GM 151 Iron Duke 2.5 L I4 · AMC 258 4.2 L I6	258: 115 hp	Narrow-track axles. 8,355 built.
1982–1983	CJ-8	GM 151 I4 · AMC 258 I6	258: 115 hp	Wide-track Dana 30 / AMC 20 axles. SR Sport and SL Sport packages.
1984–1986	CJ-8 (late)	AMC 150 2.5 L I4 · AMC 258 I6	105 hp · 115 hp	AMC's own four replaces the Iron Duke. 1985 free soft-top promotion.
1982–1986	CJ-8 with T-4 / T-5	AMC 258 I6 or 150 I4	—	BorgWarner T-4 four-speed and T-5 five-speed from 1982 per Offroaders.com (SlashGear says 1985–86 for the T-5). Some 1986 trucks got a Dana 44 rear. Only 128 sold in 1986.
1981–1986	World Cab / CJ8 Overlander	Per market	—	RHD steel full-cab with barn doors: 230 for the Alaskan postal service; Overlander for Venezuela and Australia.

Fluids, capacities & service intervals

Scramblers are rare enough that most have been half-restored at least once, so trust nothing. Change every fluid, grease every fitting, check the ignition and carburetor, and look at the AMC 20 hubs. Capacities below are from ExtremeTerrain's CJ chart, which covers the 1981–86 drivetrains.

ITEM	SPEC / CAPACITY	INTERVAL	NOTES & PARTS
Engine oil & filter	5W-30 or 10W-30 · 4.2 L six: 6 qt · 2.5 L four: 4 qt	Baseline now; then per your owner's manual	Look for rear-main and valve-cover leaks while you're under there.Oil filter, 1984 Scrambler 4.2L · RockAuto ↗CJ oil filters (all engines) · Quadratec ↗
Air filter	Paper element in the factory air cleaner	Baseline now	Fit a fresh one before you judge the carburetor.Air filter, 1984 Scrambler 4.2L · RockAuto ↗
Ignition tune-up	Plugs, cap, rotor, wires · gap and timing confirm in manual	Baseline now	The 258 fires 1-5-3-6-2-4. Duraspark pickups and modules are common culprits for poor running.Spark plug, 1984 Scrambler 4.2L · RockAuto ↗Distributor cap, 1984 Scrambler 4.2L · RockAuto ↗Crown 83502400K2 plug wire set, 1983–90 CJ 2.5L · Quadratec ↗
Coolant & thermostat	50/50 coolant · 4.2 L: 10.5 qt · Iron Duke: 7.8 qt · AMC 2.5: 11 qt	Baseline flush now	Flush until clean, fit a new thermostat and check the overflow bottle for cracks.Crown 83501426 195° thermostat, 1966–86 CJ · Quadratec ↗Coolant / antifreeze, 1984 Scrambler · RockAuto ↗Crown J5362920 coolant overflow bottle, 1981–86 CJ · Quadratec ↗
Belts & hoses	V-belts or serpentine (1984–86 with factory A/C) · molded hoses	Baseline now if cracked or soft	Squeeze every hose and replace any that feel crunchy or spongy.Crown B0015491 serpentine belt, 1984–86 CJ-7/CJ-8 4.2L with A/C · Quadratec ↗Fairchild MCH1012 heater hose, 1985–86 CJ-7/CJ-8 4.2L · Quadratec ↗Coolant hoses, 1984 Scrambler · RockAuto ↗
Manual transmission	SR-4: 80W-90, 1.5 qt · T-4 / T-5: ATF+4, 2 qt · T-176: 80W-90 confirm capacity	Baseline now	ExtremeTerrain's T-176 figure (3.5 qt / 1.7 L) contradicts itself, so check the manual. Don't put gear oil in a T-5.Yukon 80W-90 conventional gear oil · Quadratec ↗Transmission fluid (ATF), 1984 Scrambler · RockAuto ↗
Automatic transmission	TF904 / TF999: ATF+4 · 3 qt service fill (8.5 qt overhaul)	Drain, change the filter and refill now	A pan drop changes only part of the fluid. Do it twice if the old fluid is dark.Automatic transmission filter, 1984 Scrambler · RockAuto ↗Fluid pan gasket, 1984 Scrambler · RockAuto ↗
Transfer case	Dana 300 · 80W-90 · 2 qt	Baseline now	Output seals weep with age, and kits are cheap.Crown 300GK Dana 300 seal kit, 1980–86 CJ · Quadratec ↗Gear oil, 1984 Scrambler · RockAuto ↗
Front differential	Dana 30 · 80W-90 · 1.25 qt	Baseline now	ExtremeTerrain suggests 75W-140 for towing or extreme use.Yukon 80W-90 conventional gear oil · Quadratec ↗Currie CE-9013S 75W-140 gear oil · Quadratec ↗
Rear differential	AMC 20: 80W-90, 2.4 qt · Dana 44 (some 1986): 2 qt · Trac-Lok: add 4 oz limited-slip additive	Baseline now	While the cover is off, check the hubs for play. It's the AMC 20's weak point.Gear oil additive (limited-slip), 1984 Scrambler · RockAuto ↗Yukon 80W-90 gear oil (with friction modifier option) · Quadratec ↗
Front wheel bearings & hubs	Repack and adjust · preload confirm in manual	Baseline now; then after deep water	Every Scrambler uses five-bolt manual locking hubs. Check them for slipping while they're apart.Crown SET45 front outer wheel bearing kit, 1976–86 CJ · Quadratec ↗Crown SET47 front inner wheel bearing set, 1977–86 CJ · Quadratec ↗Mile Marker 470 manual locking hubs, 1981–86 CJ (5-bolt) · Quadratec ↗
Brake & clutch fluid	DOT 3	Flush now	Check the rear wheel cylinders and front calipers for weeping.Brake fluid, 1984 Scrambler · RockAuto ↗
Power steering	Power Steering +4, or ATF+4 if unavailable	Check and top up now	Box seal kits are cheap. Inspect the box mount while you're there.Crown 83500369 steering box seal kit, 1974–86 CJ power steering · Quadratec ↗
Grease points & fuel filter	U-joints and slip yokes (the long rear shaft especially) · shackles · steering joints · inline fuel filter	Grease every oil change; filter now	Replace dry or notchy U-joints now.Crown 8126637BC front axle U-joint, 1976–86 CJ · Quadratec ↗Universal joint, 1984 Scrambler · RockAuto ↗Crown J3229443 fuel filter, 1974–90 CJ 4.2L · Quadratec ↗

Capability

Wheelbase	103.5 in (2,629 mm)
Transfer case	Part-time two-speed with manual locking front hubs most with four- or five-speed manuals; three-speed automatic optional

Wheels & tires

Factory tire	205/75R15 · 235/75R15
Bolt pattern	5x139.7 (5x5.5")
Center bore	108 mm
Lug thread	1/2"-20
Biggest tire · Stock	31x10.50R15
Biggest tire · 2.5 in	33x12.50R15
Biggest tire · 4 in	33x12.50R15

Open the Jeep CJ-8 Scrambler in the tire fitment tool →

Common Jeep CJ-8 Scrambler repairs

Always confirm torque figures, fluids and capacities against the factory service manual for your VIN. See the disclaimer; some parts links are affiliate links.