1988 JEEP CHEROKEE lock

AIR RIDE SUSPENSION - SWITCH (ON/OFF) INSPECTION








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Condition Code Procedure
Broken .................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Output signal incorrect . A ............ Require replacement.









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AIR RIDE SUSPENSION - TORSION SPRINGS (COUNTER BALANCING)
AIR RIDE SUSPENSION - TORSION SPRING (COUNTER BALANCING) INSPECTION








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Condition Code Procedure
Attaching hardware bent . B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
incorrect .............. A .......... Require replacement of
incorrect part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Broken .................. A ............ Require replacement.
Missing ................. C ............ Require replacement.









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AIR RIDE SUSPENSION - TUBING
AIR RIDE SUSPENSION - TUBING INSPECTION








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Condition Code Procedure
Attaching hardware
incorrect .............. A .......... Require replacement of
incorrect part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Blocked ................. A .. Require repair or replacement.
Fitting incorrect ....... B ............ Require replacement.
Leaking ................. A .. Require repair or replacement.
Line type incorrect ..... B ............ Require replacement.
Missing ................. C ............ Require replacement.
Restricted .............. A .. Require repair or replacement.
Routed incorrectly ...... B ..... Require routing correction.

POWER STEERING HOSES
POWER STEERING HOSE INSPECTION








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Condition Code Procedure
Blistered ............... B ........... Require replacement.
Blocked ................. A . Require repair or replacement.
Fitting threads damaged . A . Require repair or replacement.
Fitting threads stripped
(threads missing) ...... A ........... Require replacement.
Inner fabric
(webbing) cut .......... A ........... Require replacement.
Leaking ................. A . Require repair or replacement.
Missing ................. C ........... Require replacement.
Outer covering is cracked
to the extent that
the inner fabric of
hose is visible ........ B ........... Require replacement.
Restricted .............. A . Require repair or replacement.









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POWER STEERING (HYDRAULIC) PUMPS
If diagnosis has determined that complete disassembly is
necessary to determine the extent of the system failure, the
suggestion may be made to rebuild or replace the power steering pump.
Repair or replacement of the following components may be required if
performed as part of a power steering pump overhaul or rebuild service
to meet a minimum rebuild standard.
POWER STEERING (HYDRAULIC) PUMP INSPECTION









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Condition Code Procedure
Attaching hardware bent . B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Belt alignment
incorrect .............. B .......... ( 1) Further inspection
required.
Belt cracked ............ 1 ............ Suggest replacement.
Belt frayed ............. 1 ............ Suggest replacement.
Belt missing ............ C ............ Require replacement.
Belt noisy .............. 2 .......... ( 2) Further inspection
required.
Belt plies separated .... A ............ Require replacement.

adjuster bent ......... A ............ (4) Require repair or
replacement of adjuster.
Torsion bar adjuster
seized ................ A .... ( 4) Require repair or replacement
of adjuster.
Torsion bar adjuster
threads damaged ....... A .... ( 4) Require repair or replacement
of part with damaged threads.
Torsion bar adjuster
threads stripped
(threads missing) ..... A ...... Require replacement of part
with stripped threads.
Vehicle suspension height
not within OEM
specifications ........ B ............ Require adjustment or
replacement.
( 1) - If vehicle is within manufacturer's height
specifications, no service is suggested or required.
( 2) - Some manufacturers require replacement under these
conditions.
( 3) - Check vehicle ride height. If ride height is OK, no
service is suggested or required.
( 4) - Only required if ride height needs to be adjusted.









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STEEL POWER STEERING LINES
CAUTION: When replacing steel power steering lines, be sure to use
a replacement product that meets or exceeds OEM design
specifications.
STEEL POWER STEERING LINE INSPECTION









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Condition Code Procedure
Attaching hardware
bent ................... B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Blocked ................. A .. Require repair or replacement.
Fitting incorrect
(such as compression
fitting) ............... B ............ Require replacement.
Flare type incorrect .... B ........... Required replacement.
Leaking ................. A ........... Require tightening or
replacement.
Line type incorrect ..... B ............ Require replacement.

of seal and/or mating part.
Splines damaged ......... A ... Require repair or replacement
of splines.
Splines stripped ........ A . Require replacement of splines.
Steering coupler
shield cracked ......... 2 ............ Suggest replacement.
Steering coupler
shield missing ......... C ............ Require replacement.
Threads damaged ......... A ... Require repair or replacement
of part with damaged threads.
Threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
U-joint binding ......... A ... Require repair or replacement
of joint.
U-joint loose ........... A ... Require repair or replacement
of joint.
Unequal power assist .... A .. Require repair or replacement.
(1) - Determine and correct source of contamination. OEM
specifications must be followed for fluid type.
( 2) - If steering gear is source of inadequate assist, require
repair or replacement.









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STEERING GEARS - RACK AND PINION
If diagnosis has determined that complete disassembly is
necessary to determine the extent of the system failure, the
suggestion may be made to rebuild or replace the power steering pump.
Repair or replacement of the following components may be required, if
performed as part of a power steering pump overhaul or rebuild service
to meet a minimum rebuild standard.
STEERING GEARS - RACK AND PINION INSPECTION









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Condition Code Procedure
Attaching hardware
broken ................. A ......... Require replacement of
broken part.
Attaching hardware
loose .................. A .. Require repair or replacement
of loose part.
Attaching hardware
missing ................ C ......... Require replacement of
missing part.
Attaching hardware
threads damaged ........ A .. Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A .... Require replacement of part
with stripped threads.
Balance tube blocked .... A .. Require repair or replacement
of balance tube.
Balance tube missing .... C .. Require replacement of balance
tube.
Balance tube restricted . A ... Require repair or replacement
of balance tube.
Bellows boot
clamp missing .......... C ... Require replacement of clamp.
Bellows boot cracked

(not through) .......... 2 .. Suggest replacement of bellows
boot.
Bellows boot missing .... C .. Require replacement of bellows
boot.
Bellows boot
not sealing ............ A ... Require repair or replacement
of bellows boot.
Bellows boot torn ....... A .. Require replacement of bellows
boot.
Bellows boot twisted
(from toe adjustment) .. B ................. Require repair.
Fitting leaking ......... A .. Require repair or replacement.
Fitting missing ......... A . Require replacement of fitting.
Fitting threads
damaged ................ A ... Require repair or replacement
of part with damaged threads.
Fitting threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Flex coupler binding .... A ... Require repair or replacement
of coupler.
Flex coupler loose ...... A ... Require repair or replacement
of coupler.
Flex coupler
missing parts .......... A ... Require repair or replacement
of coupler.
Flex coupler
soft/spongy ............ A . Require replacement of coupler.
Flex coupler torn ....... A . Require replacement of coupler.
Fluid contaminated ...... B ........ (1) Require flushing and
refilling of the system.
Gasket leaking .......... A .. Require repair or replacement.
Hard steering on cold
start-up ............... 1 ........... ( 2) Suggest repair or
replacement.
Housing cracked,
affecting structural
integrity .............. B ............ Require replacement.
Housing leaking ......... A ............ Require replacement.
Inadequate power assist . A .......... ( 3) Further inspection
required.
Lash exceeds
manufacturer's
specifications ......... B .. Require repair or replacement.
Seal leaking ............ A .. Require repair or replacement.
Splines damaged ......... A .. Require repair or replacement.
Splines stripped
(splines missing) ...... A ............ Require replacement.
Steel line blocked ...... A ... Require repair or replacement
of line.
Steel line leaking ...... A ... Require repair or replacement
of line.
Steel line missing ...... C .... Require replacement of line.
Steel line restricted ... A ... Require repair or replacement
of line.
Steering coupler shield
cracked ................ 2 ............ Suggest replacement.
Steering coupler shield
missing ................ C ............ Require replacement.
Steering coupler shield
torn ................... 2 ............ Suggest replacement.
Threads damaged ......... A ... Require repair or replacement
of part with damaged threads.

\003
TR AN SFE R C ASE - O VER HAU L ( 2 07/2 31)

1 988 J e ep C hero ke e
1983-96 TRANSFER CASES
Chrysler Corp., GM Corp., Jeep - New Process 207 & 231
Dodge; B1500 & Dakota
GMC/Chevrolet; "T" Series (Blazer & Jimmy)
Jeep; Cherokee, Comanche, Grand Cherokee, Wagoneer, Wrangler
IDENTIFICATION
Transfer case can be identified by an I.D. tag, located on
rear case. I.D. tag provides model number, serial number and low range
ratio. Date of manufacture is the serial number (I.D. number). This
information is necessary when ordering parts.
DESCRIPTION
Model 231 transfer case is a part time, chain-driven, 4-
position unit with 2-piece aluminum case. Torque input in 4WD high and
low range is undifferentiated. 2WD operation is achieved by a vacuum
shift motor. Shift motor disconnects right front axle when 2WD is
selected. Vacuum shift motor is controlled by a vacuum switch located
on front of transfer case and actuated by shift sector.
ADJUSTMENTS
GEARSHIFT LINKAGE
Chrysler Corp.
Shift transfer case to 2H position. Raise and support
vehicle. Loosen lock bolt at trunnion. Ensure linkage rod slides
freely in trunnion. Verify transfer case range lever is fully engaged
in 2H position. Tighten lock bolt at trunnion. Lower vehicle. Check
shift linkage operation. Ensure transfer case shifts into and operates
properly in all gear ranges.
General Motors
Remove shift lever knob retainer. Remove shift lever knob.
Remove floor console. Place shift lever in Neutral. Pry control cable
end from shift lever. Loosen control cable lock nut. Check transfer
case to ensure it is in Neutral. Ensure shift lever is in Neutral.
Turn shift lever end of cable in or out as needed until it is aligned
with shift lever. Install control cable on shift lever. Tighten
control cable lock nut.
Jeep
Shift transfer case to 4L position. Raise and support
vehicle. Loosen lock bolt at trunnion. Ensure linkage rod slides
freely in trunnion. Verify transfer case range lever is fully engaged
in 4L position. Tighten lock bolt at trunnion. Lower vehicle. Check
shift linkage operation. Ensure transfer case shifts into and operates
properly in all gear ranges.
TESTING
VACUUM SWITCH
Shift to 2WD position. Locate vacuum switch on front of

Will Not Shift Or Difficult To Shift Into Gear
Vehicle speed too high; slow vehicle to 2-3 MPH to shift.
Vehicle operated too long on dry paved surface; stop vehicle and place
in Reverse or Neutral to relieve driveline torque. Ensure transfer
case external linkage is not binding. Ensure correct fluid is used.
Internal parts may be worn or damaged.
Noisy In All Gears
Check fluid level. Ensure correct fluid is used. If fluid is
okay, locate possible internal mechanical problem.
Jumps Out Of Gear Or Noisy In 4WD
Transfer case not completely in gear; check shift linkage.
Range fork damaged. Shift fork pads are worn or shift fork binding.
Low range gear worn.
Fluid Leaking From Vent Or Seals
Transfer case overfilled. Vent plugged. Output shaft seals
are damaged or not installed properly.
ON-VEHICLE SERVICE
FRONT OIL SEAL
Removal & Installation
1) Mark front drive shaft and flange for installation
alignment reference. Remove front drive 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 flange seal surface. Install NEW
oil seal. Install flange and NEW washer and nut. Tighten nut to
specifications. See TORQUE SPECIFICATIONS . Install front drive shaft
using alignment marks. Check transfer case fluid.
EXTENSION HOUSING OIL SEAL & BUSHING
Removal & Installation
1) Mark rear drive shaft and flange for installation
alignment reference. Remove rear drive shaft. 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. To complete installation, reverse removal procedure.
REMOVAL & INSTALLATION
TRANSFER CASE
Removal
1) Shift transfer case into 4H and disconnect battery
negative cable. Raise vehicle, remove skid plate and drain fluid.
2) Mark front and rear output shaft yokes to drive shafts for
reassembly reference. Support transfer case and remove rear
crossmember. Remove drive shafts.
3) Disconnect vehicle speed sensor electrical connector and
vacuum (hoses) harness at transfer case. Remove shift lever or linkage\
rod from case. Remove transfer case attaching bolts. Remove transfer
case from vehicle.

TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Companion Flange Nut
Chrysler Corp. ....................... 130-200 (176-271)
General Motors ................................ 80 (108)
Jeep ......................................... 110 (149)
Detent Plug
General Motors ................................. 11 (15)
Chrysler Corp. & Jeep .......................... 15 (20)
Drain & Fill Plug .......................... 30-40 (41-54)
Extension Housing Bolt ..................... 20-25 (27-34)
Front Bearing Retainer Bolt
Chrysler Corp. & Jeep .......................... 16 (22)
General Motors ................................. 14 (19)
Front Case-to-Rear Case Bolt
Chrysler Corp.
Flange Head Bolt ........................ 35-45 (47-61)
All Other Bolts ........................ 20-25 (27-34)
General Motors ................................. 23 (31)
Jeep ..................................... 20-25 (27-34)
Range Lever Nut ............................ 15-20 (20-27)
Rear Bearing Retainer Bolt ................. 20-25 (27-34)
Rear Crossmember ................................. 30 (41)
Shift Lever Lock Bolt ............................ 10 (14)
Speed Sensor Bolt ................................ 23 (31)
Transfer Case-to-Transmission Nut ................ 26 (35)
Vacuum Switch
Chrysler Corp. ........................... 15-25 (20-34)
General Motors ................................. 17 (23)
Jeep ..................................... 20-25 (27-34)
INCH Lbs.
Control Cable Lock Nut ............................ 18 (2)









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VACUUM DIAGRAMS
For vacuum diagrams, refer to appropriate VACUUM DIAGRAMS
article in the ENGINE PERFORMANCE section.