1988 JEEP CHEROKEE Service Repair Manual

1) Clean all parts with solvent. Dry with compressed air.
Replace all oil seals, "O" rings and snap rings. Check all parts for
wear or damage. Replace all worn or damaged parts. Apply Dexron II to
all parts before installing.
2) Inspect low range annulus gear inside front case. If gear
is worn or damaged, replace case and gear as an assembly. Replace oil
pump as an assembly if any part is damaged or worn.
NOTE: When installing bearings, ensure bearing bores are aligned
with oil feed holes.
TRANSFER CASE REASSEMBLY
1) Install front output shaft front bearing, snap ring and
oil seal. Install snap ring on input gear bearing. Using a wooden
block and press, install input gear until snap ring is against case.
2) Install input gear pilot bearing. Assemble low range gear,
thrust washers, input gear and retainer. Install low range gear snap
ring. Ensure snap ring is seated properly in groove.
3) Start input gear shaft through the bearing in front case.
Using a press, install input gear shaft through bearing. Ensure
adapter is positioned properly before pressing shaft.
NOTE: Ensure proper size tool is used to press input gear shaft;
wrong size tool can damage case and thrust washers and will
move pilot bearing too far into gear bore.
4) Install input gear snap ring. Install front bearing
retainer oil seal. Apply 1/8" bead of silicone sealant to front
bearing retainer mating surface. Install front bearing retainer on
front case. Install sector shaft "O" ring and bushing. Install shift
sector.
5) Install detent pin, spring and plug. Install low range
fork pads. Assemble low range fork and hub. Ensure low range fork pin
is engaged in shift sector slot. Install differential sprocket gear in
lower differential case. Install planet gears and new thrust washers
on lower case pins.
6) Ensure thrust washers are positioned on top and bottom of
each planet gear. Install mainshaft gear. Align marks on upper and
lower differential case. Install bolts and tighten to specifications.
See TORQUE SPECIFICATIONS . Install needle bearing spacer on mainshaft.
7) Using petroleum jelly to hold needles, install bearings on
mainshaft. Install other spacer. Install differential assembly. Ensure
all needle bearings are in place. Install differential snap ring.
Install intermediate clutch shaft. Install thrust washer and snap
ring. Install mode shift sleeve in mode fork.
8) Install mode fork assembly on mainshaft. Ensure mode shift
sleeve splines engage with differential splines. Install mode fork and
mainshaft assembly in case. If necessary, rotate mainshaft slightly to
engage mainshaft with low range components.
9) Install mode fork pin into shift sector slot. Install
shift rail. Ensure shift rail is seated in shift forks. Rotate shift
sector so lock pin can be installed. Install lock pin so tapered end
is in fork and rail. Install plug. Install shift lever and nut on
shift sector shaft.
10) Install detent plunger, spring and plug. Install front
output shaft. Install drive chain and sprocket. Install drive sprocket
snap ring. Install front output shaft rear bearing.
11) Install oil seal in oil pump housing. Assemble oil pump
gears in housing. Ensure oil feed hole is aligned with hole in
housing. Install oil pump screws. Tighten to specification. Install

"O" ring in oil pump. Install oil pick-up tube and screen. Ensure
screen is properly positioned. See Fig. 2.
12) Install magnet in front case. Apply 1/8" bead of silicone
sealant to front case mating surface. Assemble case halves together.
Tighten to specification. Ensure mainshaft splines are engaged with
oil pump inner gear and a washer is used on bolts at dowel locations.
13) Install rear retainer bearing in retainer. Apply 1/8"
bead of silicone sealer and install retainer to case. Install rear
bearing snap ring. Install extension housing. Install front companion
flange. Install vacuum switch and drain plug. Fill transfer case with
Dexron II.
Fig. 2: Identifying Oil Pump Screen Position
Courtesy of Chrysler Motors.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Companion Flange Nut .................... 90-130 (122-176)
Detent Plug ...................................... 14 (19)
Drain & Fill Plug ................................ 27 (37)
Extension Housing Bolt ........................... 26 (35)
Front Bearing Retainer Bolt ...................... 12 (16)
Front Case-to-Rear Case Bolt ............... 26-34 (35-46)
Shift Fork Set Screw ............................. 15 (20)
Transfer Case-to-Transmission .................... 26 (35)









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TR AN SM IS SIO N R EM OVA L & IN STA LLA TIO N - A /T

1988 J e ep C hero ke e
1988 Automatic Transmission Removal
JEEP
TRANSMISSION
ALL MODELS
Removal
1) Disconnect fan shroud and transmission fill tube upper
bracket. Raise vehicle. Remove converter inspection cover and fill
tube. Remove starter.
2) Mark drive shafts for reassembly. Disconnect shafts at
transfer case and wire to frame rails. DO NOT allow shafts to hang
free as damage to universal joints may result. On V8 models,
disconnect exhaust pipes from exhaust manifolds. Drain transfer case
lubricant. Disconnect speedometer cable from transmission.
3) Disconnect all shift and throttle linkages and wiring
from transmission and transfer case. Mark converter drive plate and
converter for reassembly and remove torque converter-to-drive plate
bolts. Rotate crankshaft to gain access to bolts.
4) Support transmission/transfer case assembly with jack and
secure with chain. Remove bolts and rear transmission crossmember.
Lower transmission enough to disconnect cooler lines at transmission.
Remove transmission-to-engine retaining bolts and slowly slide
transmission assembly away from engine.
5) Hold converter in position while lowering transmission
assembly from vehicle. Separate transmission from transfer case.
Installation
To install, reverse removal procedures. DO NOT tighten
exhaust pipe attaching bolts until crossmember has been installed and
transmission jack has been removed. Make sure all index marks made at
removal are aligned. Tighten all bolts to specification and fill
transmission and transfer case with fluid.
TORQUE SPECIFICATIONS
TIGHTENING SPECIFICATIONS








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Application Ft. Lbs. (N.m)\
Cooler Line Nuts ........................................... 25 (34)\
Torque Converter-to-Drive Plate Bolts ...................... 22 (30)\
Transfer Case-to-Transmission Bolts ........................ 40 (54)\
Transmission-to-Engine Bolts ............................... 30 (41)\









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TR AN SM IS SIO N R EM OVA L & IN STA LLA TIO N - M /T

1988 J e ep C hero ke e
1988 MANUAL TRANSMISSION REMOVAL
Jeep
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
REMOVAL & INSTALLATION
TRANSMISSION
Removal
1) Remove screws attaching shift lever boot to floorpan.
Slide boot over lever. On models with T-176 transmission, press and
turn shift lever retainer counterclockwise to release lever.
2) Remove lever, boot, spring and seat as an assembly. On all
models, raise vehicle and support with safety stands. Disconnect rear
drive shaft from transfer case and wire out of way.
3) DO NOT allow shaft to hang free, as damage to universal
joint may result. Disconnect front parking brake cable at equalizer.
Remove rear cable clip from crossmember.
4) Place a jack under clutch housing to support engine.
Remove rear crossmember from frame. Disconnect speedometer cable,
back-up light switch wire and 4WD indicator switch wire.
5) Disconnect transfer case vent hose. Disconnect front drive
shaft and wire out of way. On Wrangler, remove transfer case shift
lever by removing shifter shaft retaining nut.
6) Remove cotter pins retaining shift control link pins in
shift rods and remove pins. Remove shifter shaft and disengage shift
lever from shift control links. Move lever out of the way.
NOTE: On some models, shifter shaft must be unthreaded from shift
lever in order to be removed. On other models, shaft can be
removed by sliding it out of lever.
7) Remove cotter pin and washers connecting link to shift
lever. Separate link from lever. Support transmission and transfer
case with jack.
8) Remove bolts securing transmission to clutch housing and
remove transmission and transfer case. Separate transfer case and
transmission.
Installation
1) Install pilot bushing lubricating wick and align throw out
bearing with splines in driven plate hub. Shift transmission into gear
using shift lever or a long screwdriver. This prevents clutch shaft
from rotating during installation and makes clutch shaft-to-driven
plate spline alignment easier.
2) Mount transmission on transmission jack. Raise
transmission and align transmission clutch shaft with splines in
driven plate hub.
3) When transmission is seated on clutch housing, install and
tighten transmission-to-clutch housing bolts. Apply Permatex No. 3
sealer to both sides of replacement transmission output shaft and
transfer case input shaft splines.
4) To install transmission, reverse removal procedure. Adjust
clutch and shift linkage.
TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Transmission-to-Clutch Housing ..................... 55 (75)
Transmission Cover Bolts ..................... 55-65 (75-88)
Housing-to-Transmission Case ................. 40-45 (54-61)
Crossmember Attaching Bolts .................. 34-40 (46-54)
Filler Plug .................................. 13-15 (18-20)









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TR AN SM IS SIO N S ER VIC IN G - A /T

1988 J e ep C hero ke e
1988 Automatic Transmission Servicing
JEEP
LUBRICATION
SERVICE INTERVALS
Transmission
Check fluid level and condition of fluid at each engine oil
change. Under normal, light duty operating conditions, change fluid,
replace filter and adjust bands every 2 yrs. or 25,000 miles. Under
heavy duty service, change fluid, replace filter and adjust bands
every 12 months or 12,500 miles.
Transfer Case
Check transfer case fluid every 12,000 miles and replace
fluid every 30,000 miles.
CHECKING FLUID LEVEL
Transmission
Park vehicle on a level surface and apply parking brake.
With engine idling at normal operating temperature, move transmission
selector lever through all gears, ending in "N" ("P" for AW-4
transmission). Check fluid level. Fluid level should be between
"FULL" and "ADD ONE PINT" mark on dipstick. Add fluid as needed. DO
NOT overfill.
Transfer Case
Remove fill plug. Check oil level. If level is not up to
fill plug opening, add lubricant until it is.
RECOMMENDED FLUID
Both transmissions and transfer cases use DEXRON-II ATF.
FLUID CAPACITY
NOTE: Transmission and converter capacities are approximate. Fluid
level should always be determined by reading on dipstick,
rather than amount of fluid added.
TRANSMISSION REFILL CAPACITIES









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Application Quantity
All Models
Including Converter ................................ 8.5 qts. (8.0L)\
Without Converter .................................. 4.3 qts. (4.0L)\









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TRANSFER CASE REFILL CAPACITIES








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Application Capacity
Model 207 ............................................ 4.5 pts. (2.1L)\
Model 208 ............................................ 6.0 pts. (2.8L)\

Model 228 ............................................ 7.0 pts. (3.3L)\
Model 229 ............................................ 6.0 pts. (3.8L)\









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DRAINING & REFILLING
Transmission
1) Loosen oil pan bolts, tap pan to break it loose and allow
fluid to drain. Remove pan. Install new filter on bottom of valve
body and tighten retaining screws. Install new "O" ring on fluid
pick-up pipe (if needed). Clean oil pan and install with new gasket.
2) Refill transmission with fluid. Start engine and allow to
run at curb idle for a few minutes. With vehicle on level surface,
engine idling and parking brake applied, move shift selector lever
through all gear ranges, ending in "N" ("P" for AW-4 transmission).
Add fluid up to "ADD ONE PINT" mark on dipstick.
3) Recheck fluid level when transmission reaches normal
operating temperature. Fluid should be between "ADD ONE PINT" and
"FULL" marks on dipstick. Transmission must NOT be overfilled.
Transfer Case
Remove drain plug from transfer case. Remove fill plug for
easier draining. With fluid fully drained, reinstall drain plug. Fill
transfer case to fill plug opening with Dexron II.
ADJUSTMENT
NOTE: Bands on the AW-4 (4-speed overdrive) transmission are not
adjustable. If slippage occurs, bands must be replaced.
KICKDOWN (FRONT) BAND
1) Locate kickdown band adjusting screw on left side of case
(near throttle lever shaft). Loosen adjusting screw lock nut and back
off approximately 5 turns. Ensure adjusting screw turns freely in
case.
2) Using Adapter (J-24063) and 5/16" square socket, tighten
screw to 36 INCH lbs. (4 N.m). If adapter is not used, tighten screw
to 72 INCH lbs. (8 N.m). Back off adjusting screw. See KICKDOWN
(FRONT) BAND ADJUSTMENT table. Hold adjusting screw in position and
tighten lock nut to 35 ft. lbs. (48 N.m).
KICKDOWN (FRONT) BAND ADJUSTMENT









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Application (1) Back Off Screw\
All Models ............................................... 2 1/2 Turns
(1) - Tighten screw to 72 INCH lbs. (8 N.m) and back off indicated
number of turns.









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LOW-REVERSE (REAR) BAND
1) Raise vehicle, drain transmission fluid and remove oil
pan. Locate adjusting screw on rear servo lever. Loosen adjusting
screw lock nut and back off about 5 turns.
2) Tighten screw to 41 INCH lbs. (4.6 N.m) and back off
screw at indicated number of turns. See LOW-REVERSE (REAR) BAND
ADJUSTMENT table. Hold adjusting screw in position and tighten lock
nut to 35 ft. lbs. (48 N.m). Install oil pan and fill transmission