1988 JEEP CHEROKEE front diff

AXLE ASSEMBLY SPECIFICATIONS TABLE








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Application Specification
Axle Shaft End Play ........................ .004-.008" (.10-.20 mm)\
Differential Bearing Preload ........................ .008" (.20 mm)\
Differential Case Face Runout ....................... .002" (.05 mm)\
Differential Side Gear Case Clearance ........... 0-.007" (0-.18 mm)\
Oil Capacity
Standard Drive Axle .............................. 2.5 pts. (1.2L)\
Heavy Duty Drive Axle ............................. 4.7 pts (2.2L)\
Pinion Bearing Preload ................... 15-25 INCH lbs. (2.3 N.m)\
Pinion Gear Depth (Standard)
Standard Drive Axle ............................ 2.095" (53.21 mm)\
Heavy Duty Drive Axle ........................... 2.547" (64.7 mm)\
Ring Gear
Backlash ................................. .005-.009" (.13-.23 mm)\
Preferred ......................................... .008" (.20 mm)\









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TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Axle Housing Cover ......................................... 14 (19)\
Axle-to-Leaf Spring "U" Bolts .............................. 52 (70)\
Brake Support Plate Bolts .................................. 32 (43)\
Differential Bearing Bolts
Standard Drive Axle ...................................... 57 (77)\
Heavy Duty Drive Axle ................................... 85 (115)\
Rear Axle Filler Plug
Standard Drive Axle ...................................... 25 (34)\
Heavy Duty Drive Axle .................................... 15 (20)\
Rear Spring Front Bolt ................................... 111 (150)\
Rear Spring Rear Shackle Nuts ............................ 111 (150)\
Ring Gear Bolts
Standard Drive Axle ............................... 70-90 (95-122)\
Heavy Duty Drive Axle .................................. 105 (142)\
Shock Absorber-to-Axle Nut ................................. 44 (60)\
Universal Joint Clamp Strap Bolts .......................... 14 (19)\
Wheel Lug Nuts ............................................ 75 (102)\









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PINION DEPTH SHIM ADJUSTMENT SPECIFICATIONS
PINION DEPTH SHIM ADJUSTMENT CHART (INCHES)








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Old Pinion Marking Specification
+4
New Pinion Marking
-4 ....................................... +0.008
-3 ....................................... +0.007
-2 ....................................... +0.006
-1 ....................................... +0.005
0 ........................................ +0.004
+1 ....................................... +0.003
+2 ....................................... +0.002
+3 ....................................... +0.001
+4 ............................................ 0

2) On models with 2-piece shafts, rotate transmission yoke
until trunnion is in horizontal plane. Install front drive shaft with
"U" joint trunnion in vertical plane. Connect bearing support to
crossmember.
3) Ensure that front face of bearing support is perpendicular
(90 degrees) to centerline of drive shaft. Install rear drive shaft
with "U" joint trunnion of slip joint in vertical plane.
4) Set differential pinion yoke trunnion in vertical plane.
Connect rear drive shaft to pinion yoke. If 2-piece shaft is correctly
installed, centerline of trunnions at each end of individual shafts
will be parallel. See Fig. 3.
Fig. 3: Phase Alignment Of 2-Piece Drive Shafts
Trunnion yoke ears on each shaft must be parallel.
DRIVE SHAFT BALANCE TEST
1) Drive shaft imbalance may often be cured by disconnecting
shaft and rotating it 180 degrees in relation to other components.
Test by raising rear wheels off ground, and turning shaft with engine.
NOTE: DO NOT run engine without ram airflow across radiator for
prolonged periods, as overheating of engine or transmission
may occur.
2) On most models, balance testing may be done by marking
shaft in 4 positions, 90 degrees apart. Place marks approximately 6"
forward of weld, at rear end of shaft. Number marks one through 4.
3) Place screw-type hose clamp so clamp head is in number one
position, and rotate shaft with engine. If there is little or no
change, move clamp head to No. 2 position, and repeat test.
4) Continue procedure until vibration is at lowest level. If
no difference is noted with clamp head moved to all 4 positions,
vibrations may not be drive shaft imbalance.
5) If vibration is lessened but not completely gone, place 2
clamps at that point, and run test again. Combined weight of clamps in
one position may increase vibration. If so, rotate clamps 1/2" apart,
above and below best position, and repeat test.
6) Continue to rotate clamps as necessary, until vibration is
at lowest point. If vibration level is still unacceptable, leave rear
clamp(s) in position and repeat procedure at front end of drive shaft.\
If vibration can be eliminated or reduced to acceptable levels using
this test procedure, send drive shaft out to be balanced.

Engine Coolant In coolant overflow bottle.
Engine Oil In oil pan.
Front/Rear Axles On front/rear of differential.
Power Steering In power steering pump
reservoir.
Transfer Case In rear portion of transfer
case.
Transmission On fill plug (M/T) or dipstick\
(A/T).
Windshield Washer On bottom of windshield washer
reservoir.
Fuel Gauge Sending Unit In fuel tank.

length of cylinder block at several points.
If warpage exceeds specifications, deck must be resurfaced.
If warpage exceeds manufacturer's maximum tolerance for material
removal, replace block.
DECK HEIGHT
Distance from the crankshaft centerline to the block
deck is termed the deck height. Measure and record front and rear main
journals of crankshaft. To compute this distance, install crankshaft
and retain with center main bearing and cap only. Measure distance
from the crankshaft journal to the block deck, parallel to the
cylinder centerline.
Add one half of the main bearing journal diameter to distance
from crankshaft journal to block deck. This dimension should be
checked at front and rear of cylinder block. Both readings should be
the same.
If difference exceeds specifications, cylinder block must be
repaired or replaced. Deck height and warpage should be corrected at
the same time.
MAIN BEARING BORE & ALIGNMENT
For checking main bearing bore, remove all bearings from
cylinder block and main bearing caps. Install main bearing caps in
original location. Tighten bolts to specification. Using inside
micrometer, measure main bearing bore in 2 areas 90 degrees apart.
Determine bore size and out-of-round. If diameter is not within
specification, block must be align-bored.
For checking alignment, place a straightedge along centerline
of main bearing saddles. Check for clearance between straightedge and
main bearing saddles. Block must be align-bored if clearance is
present.
EXPANSION PLUG REMOVAL & INSTALLATION
Removal
Drill a hole in the center of expansion plug. Remove with
screwdriver or punch. Use care not to damage sealing surface.
Installation
Ensure sealing surface is free of burrs. Coat expansion plug
with sealer. Use a wooden dowel or pipe of slightly smaller diameter,
install expansion plug. Ensure expansion plug is evenly located.
OIL GALLERY PLUG REMOVAL & INSTALLATION
Removal
Remove threaded oil gallery plugs using the appropriate
wrench. Soft, press-in plugs are removed by drilling into plug and
installing a sheet metal screw. Remove plug with slide hammer or
pliers.
Installation
Ensure threads or sealing surface is clean. Coat threaded oil
gallery plugs with sealer and install. Replacement soft press-in plugs
are driven in place with a hammer and drift.
CAMSHAFT
* PLEASE READ THIS FIRST *

NOTE: Always refer to appropriate engine overhaul article in the
ENGINES section for complete overhaul procedures and
specifications for the vehicle being repaired.
CLEANING & INSPECTION
Clean camshaft with solvent. Ensure all oil passages are
clear. Inspect cam lobes and bearing journals for pitting, flaking or
scoring. Using micrometer, measure bearing journal O.D.
Support camshaft at each end with "V" blocks. Position dial
indicator with tip resting on center bearing journal. Rotate camshaft
and note reading. If reading exceeds specification, replace camshaft.
Check cam lobe lift by measuring base circle of camshaft
using micrometer. Measure again at 90 degrees to tip of cam lobe. Cam
lift can be determined by subtracting base circle diameter from tip of
cam lobe measurement.
Different lift dimensions are given for intake and exhaust
cam lobes. Reading must be within specifications. Replace camshaft if
cam lobes or bearing journals are not within specifications.
Inspect camshaft gear for chipped, eroded or damaged teeth.
Replace gear if damaged. On camshafts using thrust plate, measure
distance between thrust plate and camshaft shoulder. Replace thrust
plate if not within specification.
CAMSHAFT BEARINGS
Removal & Installation
Remove the camshaft rear plug. The camshaft bearing remover
is assembled with its shoulder resting on the bearing to be removed
according to manufacturer's instructions. Tighten puller nut until
bearing is removed. Remove remaining bearings, leaving front and rear
bearings until last. These bearings act as guide for camshaft bearing
remover.
To install new bearings, puller is rearranged to pull
bearings toward the center of block. Ensure all lubrication passages
of bearing are aligned with cylinder block. Coat new camshaft rear
plug with sealant. Install camshaft rear plug. Ensure plug is even
in cylinder block.
CAMSHAFT INSTALLATION
Lubricate bearing surfaces and cam lobes with ample amount of
Molykote or camshaft lubricant. Carefully install camshaft. Use care
not to damage bearing journals during installation. Install thrust
plate retaining bolts (if equipped). Tighten bolts to specification.
On overhead camshafts, install bearing caps in original location.
Tighten bolts to specification. Check end play.
CAMSHAFT END PLAY
Using dial indicator, check end play. Position dial indicator
on front of engine block. Position indicator tip against camshaft.
Push camshaft toward rear of engine and adjust indicator to zero.
Move camshaft forward and note reading. Camshaft end play
must be within specification. End play may be adjusted by relocating
gear, shimming thrust plate or replacing thrust plate depending on
manufacturer.
TIMING CHAINS & BELTS

Command-Trac .............................. 2.2 Pts. (1.0L)
Drive Axles (3)
Front ....................................... 2.5 Pts. (1.2L)
Front (Disconnect Housing) ( 4) ............. 5.0 Ozs. (0.15L)
Rear ........................................ 2.5 Pts. (1.2L)
Rear (Trac-Lok) ( 5) ......................... 2.5 Pts. (1.2L)
( 1) - Capacities are recommended or calculated levels. Always use
dipstick (if available) to measure level.
( 2) - Includes 2.3 Qts. for coolant recovery bottle.
( 3) - Fill to bottom of filler plug hole.
( 4) - Add 5 Ozs. of gear lubricant through indicator switch hole.
( 5) - Add 2 Ozs. of Limited-Slip differential lubricant additive
first, then add new fluid.









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WHEEL & TIRE SPECIFICATIONS
WHEEL & TIRE SPECIFICATIONS TABLE








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Wheel Size Tire Size
Cherokee
15x6 & 15x7 (Aluminum Or Steel) ............. P195/75R15
15x6 & 15x7 (Aluminum Or Steel) ............. P205/75R15
15x6 & 15x7 (Aluminum Or Steel) ............. P215/75R15
15x6 & 15x7 (Aluminum Or Steel) ............. P225/75R15
Wagoneer
15x6 (Aluminum/Steel) ....................... P205/75R15
All Models
16-Inch Wheels ...................... Compact Spare Tire









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TIRE REPLACEMENT
CAUTION: Always ensure all 4 tires on the vehicle are the same size,
except when using the temporary spare. The use of
mismatched tires may cause unpredictable handling.
Replacing original tires with tires of a different size may
result in false speedometer and odometer indications.
TIRE INFLATION
The tire specification decal is located in the glove box.
WHEEL TIGHTENING
Tighten the lug nuts firmly in a crisscross pattern as shown
in Fig. 11 . Tighten to 95 ft. lbs (129 N.m). Always position wheel
locking nut opposite valve stem in position indicated. See Fig. 11.
Fig. 11: Wheel Locking Nut Location
Courtesy of American Motors Corp.

computers may lose memory data. When battery power is
restored, driveability problems may exist on some vehicles.
These vehicles may require a relearn procedure. See COMPUTER
RELEARN PROCEDURES article in GENERAL INFORMATION section.
REPLACING BLOWN FUSES
Before replacing a blown fuse, remove ignition key, turn off
all lights and accessories to avoid damaging the electrical system. Be
sure to use fuse with the correct indicated amperage rating. The use
of an incorrect amperage rating fuse may result in a dangerous
electrical system overload.
BRAKE PAD WEAR INDICATOR
Indicator will cause a squealing or scraping noise, warning
that brake pads need replacement.
BRAKE WARNING LIGHT
CAUTION: If BRAKE warning light is on with parking brake disengaged
and engine running, there may be a problem in the hydraulic
brake system. Braking effort, brake pedal travel and
stopping distances may increase.
CATALYTIC CONVERTER
To prevent catalytic converter overheating, DO NOT allow
engine to idle for more than 20 minutes.
COMMAND-TRAC (4WD)
CAUTION: NEVER operate a Command-Trac vehicle in 4WD on dry,
hard-surfaced roads for a sustained period. Use 4L only
when needed for added pulling power. Operating vehicle in
4WD mode on such roads will cause stress and possible
damage to components, as well as make shifting difficult.
To reduce shifting effort, drive vehicle in Reverse for a
few feet, or drive off hard-surfaced road momentarily to
allow tire slippage.
FRONT AND REAR DIFFERENTIALS (4WD)
CAUTION: DO NOT use water, steam, kerosene or gasoline for flushing
a differential. ONLY use a flushing oil.
TRAC-LOK DIFFERENTIALS (4WD)
CAUTION: DO NOT flush a rear axle Trac-Lok differential. Trac-Lok
differentials may be cleaned only by disassembling the
unit and wiping the components with clean, lint-free cloth.
CAUTION: NEVER attempt to engage Low range when vehicle is moving
faster than 2-3 MPH, as transfer case damage may result.
GASOLINE CONTAINING ALCOHOL
CAUTION: Exclusive use of gasohol is not recommended. Vehicle test
results have shown that significant fuel system corrosion
can result when gasohol is used exclusively.

 AX5 (AISIN) .................................. 7.0 Pts. (3.3L) \


T5 (Borg-Warner) ............................. 4.5 Pts. (2.1L) \


Transfer Case 

1985-86 

Selec-Trac (229 Full-Time) ................. 6.0 Pts. (2.8L) \


Command-Trac (Part-Time 207) ............... 4.5 Pts. (2.1L) \


1987 

Selec-Trac ................................. 2.5 Pts. (1.2L) 

Command-Trac ............................... 2.2 Pts. (1.0L) 

1988 

Selec-Trac ................................. 3.0 Pts. (1.4L) 

Command-Trac ............................... 2.2 Pts. (1.0L) 

Drive Axles (
3) 

Front ........................................ 2.5 Pts. (1.2L) 

Front (Disconnect Housing) .................. 5.0 Ozs. (0.15L) \


Rear ......................................... 2.5 Pts. (1.2L) 

Rear (Trac-Lok) (
4) .......................... 2.5 Pts. (1.2L) 



(
1) - Capacities are recommended or calculated levels. Always use 

dipstick (if available) to measure level. 

(
2) - Includes 2.3 qts. for coolant recovery bottle. 

(
3) - Fill to bottom of filler plug hole. 

(
4) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant 

additive first, then add new fluid. 










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15,000 MILE (24,000 KM) SERVICE
15,000 MILE (24,000 KM) SERVICE







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Service Or Inspect 









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Verify Last Major Service Was Performed 




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 Check Fluid Levels 




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 Check Cooling System Hoses and Clamps 




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 Check Coolant Strength 




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 Check Exhaust System & Heat Shielding 




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 Clean Battery and Battery Terminals 




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 Accessory Drive Belts 




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 Inspect Brake System 




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 Inspect C/V Joint boots (4WD) 




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 Inspect Underside of Vehicle (Bolts & Threaded Fasteners) 




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 Check/Lube Manual Steering Gear 




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 Check Drive Shaft Seals 




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 Lubricate Ball Joints, Steering Linkage & Suspension 




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 Lube Drive Shaft U-Joints and Slip Splines 




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 Lube Front Axle Drive Joint and Pivot Bearings (4WD) 




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