1988 JEEP CHEROKEE transmission fluid

Removal & Installation
1) Mark front propeller shaft and flange for alignment
purposes. Remove front propeller shaft. Remove flange. Discard washer
and nut. Using a screwdriver, carefully remove oil seal. Ensure seal
contact surface is clean.
2) Apply ATF to seal lip and yoke seal surface. Install oil
seal and flange with new washer and nut. Install front propeller shaft
using alignment marks. Check transfer case fluid.
EXTENSION HOUSING OIL SEAL & BUSHING
NOTE: When replacing oil seal, DO NOT remove extension housing.
Removal & Installation
1) Mark rear propeller shaft and flange for installation
purposes. Remove rear propeller shaft. Remove bolts and tap extension
housing in a clockwise direction and remove extension housing. DO NOT
pry on extension housing. Using a screwdriver, remove oil seal from
extension housing.
2) Using bushing driver, replace bushing in extension
housing. Install new extension housing oil seal. Apply silicone
sealant to extension housing mating surface. Install extension
housing. Reverse removal procedure to complete installation.
REMOVAL & INSTALLATION
TRANSFER CASE
Removal & Installation
1) Shift transfer case into Neutral position and drain fluid.
Mark front and rear drive shaft for installation purposes. Remove
front and rear drive shafts. Disconnect vacuum lines and speedometer
cable. Remove rear crossmember.
2) Disconnect shift linkage. Support transfer case with a
jack. Separate transfer case from transmission. Remove transfer case.
To install, reverse removal procedure. Tighten bolts to specification.
See TORQUE SPECIFICATIONS . Adjust shift linkage, if necessary.
TRANSFER CASE DISASSEMBLY
1) Remove drain and fill plugs. See Fig. 1. Remove front
companion flange, washer and seal. Place transfer case in 4L position.
Remove extension housing. See EXTENSION HOUSING OIL SEAL & BUSHING
under ON-VEHICLE SERVICE. Remove rear bearing snap ring. Remove rear
bearing retainer. Separate rear case from front case using prybars or
screwdriver. DO NOT damage mating surfaces.
NOTE: DO NOT disassemble oil pump, replace as unit only.
2) Remove oil pump, pick-up tube and screen from rear case.
Remove pick-up tube "O" ring from oil pump. Remove magnet from front
case. Remove drive sprocket snap ring. Remove drive sprocket and drive
chain.
3) Remove front output shaft. Remove shift lever from sector
shaft. Remove shift detent plug, spring and plunger. Remove plug from
low range fork lock pin access hole. Move shift sector until lock pin
is aligned with hole. Remove lock pin with No. 1 screw extractor.
4) Remove shift rail from fork assembly. Remove mode fork and
mainshaft as an assembly. Record mode sleeve position. Remove mode
shift sleeve and mode fork assembly. Remove sleeve from fork. Remove

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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 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

with fluid.
LOW-REVERSE (REAR) BAND ADJUSTMENT









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Tighten Screw to Back Off
Application INCH Lbs. (N.m) Screw\
Model 727 ................. 41 (4.6 N.m.) .................... 2 Turns\
Model 904 ................. 41 (4.6 N.m.) .................... 7 Turns\
Model 999 ................. 41 (4.6 N.m.) .................... 4 Turns\









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TRANSMISSION THROTTLE CABLE/LINKAGE
NOTE: A special Idle Speed Actuator (ISA) Exerciser Box Tool is
required to initially set ISA motor and adjust transmission
throttle linkage on vehicles with transmission model 999
with 4-cylinder engines.
727 Transmission with 6-Cylinder Engines
1) Disconnect throttle control rod spring. Use spring to
hold transmission throttle control lever forward, against stop. Block
choke open and release fast idle cam.
2) On carburetors equipped with throttle operated solenoid
valve, turn key to "ON" position to energize solenoid. Open throttle
halfway to allow solenoid to lock. Return throttle to idle position.
3) Loosen retaining bolt on throttle control adjusting link.
DO NOT remove spring clip or nylon washer. Pull on end of link to
eliminate lash. Tighten link retaining bolt. Reconnect throttle
control rod spring.
727 Transmission with V8 engines
1) Disconnect throttle control rod spring. Use spring to
hold transmission throttle valve control lever against forward stop.
Block choke open and release fast idle cam.
2) On carburetors equipped with throttle operated solenoid
valve, turn key to "ON" position to energize solenoid. Open throttle
halfway to allow solenoid to lock. Return throttle to idle position.
3) Loosen retaining bolt on throttle control rod adjusting
link. Remove spring clip and slide nylon washer to rear of link. Push
on end of link to eliminate lash and tighten retaining bolt. Install
nylon washer and spring clip. Reconnect throttle control rod spring.
904 Transmission with 6-Cylinder Engines
1) Remove air cleaner. Hold throttle control lever rearward
against its stop. Block choke plate open and set carburetor linkage
completely off fast idle cam.
2) Unlock throttle control cable by lifting "T" shaped
adjuster clamp with small screwdriver. Move cable outer sheath
forward to remove any cable load on throttle cable bellcrank.
3) Adjust cable by moving cable and sheath rearward until
there is no lash between cable and throttle linkage. Lock cable by
pressing "T" shaped clamp downward until clamp snaps into place.
Install and reconnect any parts removed and/or disconnected.
999 Transmission with 4-Cylinder Engines
1) Raise vehicle. Using a spring, hook one end on throttle
control lever and other end on torque converter housing. Lower
vehicle.
2) Disconnect the ISA motor and connect Exerciser Box to
ISA. Adjustment light should turn off and ready light should turn on.
Press retrack button. Wait until ISA adjusts, ready light goes off
and adjust light goes on.

only exist when transmission is in "P" or "N".
3) Check for continuity between 2 outer pins. Continuity
should exist with transmission in "R" only. There should be no
continuity between either outer pin and transmission case. If any of
these conditions are not met, the switch should be replaced.
4) To replace switch, unscrew from case. Move selector lever
to "P" and "N" positions and check that switch operating fingers are
centered in switch opening. Install switch and new seal in case.
Check fluid level and add as needed.

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

1988 J e ep C hero ke e
1988 MANUAL TRANSMISSION SERVICING
Jeep
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
LUBRICATION
SERVICE INTERVALS
Transmission
Under normal driving conditions, check fluid level every 5000
miles or when serviced. Under severe driving conditions, check fluid
level every 3000 miles. Transmission lubricant should be changed at
27,500 mile intervals.
Transfer Case
Check transfer case fluid every 12,000 miles and replace
fluid every 30,000 miles.
CHECKING FLUID LEVEL
Transmission
Check lubricant level at transmission filler plug hole.
Lubricant should be level with bottom of hole. Add lubricant as
needed.
Transfer Case
Remove fill plug. Check oil level. If level is not up to fill
plug opening, add lubricant until it is.
RECOMMENDED FLUID
Transmission
Recommended lubricant for Jeep with manual transmission is
AMC/Jeep Manual Transmission Fluid (89 83 000 000) or 75W-90 GL-5 gear\
lubricant.
Transfer Cases
Transfer cases use DEXRON-II ATF.
FLUID CAPACITY
NOTE: Capacities given are approximate. Correct fluid level should
be determined by level at filler plug hole.
TRANSMISSION REFILL CAPACITIES









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Application Quantity
4-Speed
AX4 .......................... 7.4 pts. (3.5L)
T176 ......................... 3.5 pts. (1.7L)
5-Speed
AX5 .......................... 7.0 pts. (3.3L)
BA 10/5 ...................... 3.5 pts. (1.6L)









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TRANSFER CASE REFILL CAPACITIES

CAPACITIES
FLUID CAPACITIES








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Application Quantity
Auto. Trans. (Dexron II)
Wrangler ......................................... 8.0 qts. (7.6L)\
All Others ....................................... 8.5 qts. (8.0L)\
Cooling System
Wrangler ......................................... 9.0 qts. (8.5L)\
All Others ...................................... 10.0 qts. (9.5L)\
Crankcase (Includes Filter) ........................ 4.0 qts. (3.8L\
)
Drive Axle
Front ............................................ 2.5 pts. (1.2L)\
Rear
Commanche
Standard Capacity ............................ 2.5 pts. (1.2L)\
Metric Ton Axle .............................. 4.8 pts. (2.3L)\
All Others ..................................... 2.5 pts. (1.2L)\
Fuel Tank
Cherokee & Wagoneer
Standard ...................................... 13.5 gals. (51L)\
Optional ........................................ 20 gals. (76L)\
Comanche
Standard ........................................ 16 gals. (60L)\
Optional ...................................... 23.5 gals. (89L)\
Wrangler
Standard ........................................ 15 gals. (57L)\
Optional ........................................ 20 gals. (75L)\
Manual Transmission
AX4 .............................................. 7.8 pts. (3.7L)\
AX5 .............................................. 7.4 pts. (3.5L)\
BA 10/5 .......................................... 3.5 pts. (1.6L)\
Transfer Case (Dexron II)
Wrangler ........................................ 3.25 pts. (1.5L)\
All Others
Command Trac ................................... 2.2 pts. (1.0L)\
Select Trac .................................... 3.0 pts. (1.4L)\









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SYSTEM REFRIGERANT CAPACITIES








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Application Ozs.
All Models ...................................................... 36









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