TRANSMISSION SERVICING - A/T

1988 Jeep Cherokee

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

Application Quantity

All Models

Including Converter 8.5 qts . (8.0L)

Without Converter 4.3 qts. (4.0L)

TRANSFER CASE REFILL CAPACITIES

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)

DRAINING & REFILLING

Transmission

3. 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.

4. 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.

5. 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

3. 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.

4. 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

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.

LOW-REVERSE (REAR) BAND

3. 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.

4. 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

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

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

3. Disconnect throttle control rod spring. Use spring to
   hold transmission throttle control lever forward, against stop. Block
   choke open and release fast idle cam.

4. 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.

5. 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

3. Remove air cleaner. Hold throttle control lever rearward
   against its stop. Block choke plate open and set carburetor linkage
   completely off fast idle cam.

4. 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.

5. 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

3. Raise vehicle. Using a spring, hook one end on throttle
   control lever and other end on torque converter housing. Lower
   vehicle.

4. 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.

3) Loosen bolt on throttle control link. Pull on link end to eliminate lash. Tighten adjusting bolt. Press extend button on Exerciser Box. When ISA retracts, release button and disconnect Exerciser Box. Connect ISA wiring and remove spring from throttle control lever. Install and reconnect any parts removed and/or disconnected.

999 Transmission with 6-Cylinder Engines

3. Disconnect throttle control rod spring. Use spring to
   hold adjusting link in forward position, against nylon washer. Block
   choke open and release fast idle cam.

4. Raise vehicle. Loosen both retaining bolts on adjusting
   link clamp. DO NOT remove spring clip or nylon washer. Use a spare
   spring to hold transmission throttle lever against forward stop.

5. Push adjusting link to eliminate lash and pull clamp to
   rear so that bolt in rod bottoms in rear of slot in rod. Tighten
   forward clamp retaining bolt.

4) Pull throttle control rod to the rear so that bolt in rod bottoms in front of slot and tighten rear retaining bolt. Remove spare spring. Lower vehicle and reconnect throttle control rod spring.

AW-4 Transmission with All Engines

3. With ignition off, retract cable self-adjusting mechanism
   fully. Press cable button down and push cable plunger inward.

4. Rotate throttle lever to wide open throttle position.
   While holding throttle lever in position, allow cable plunger to
   extend. When plunger is fully extended, release throttle lever. Cable
   is now adjusted.

SHIFT LINKAGE

Cable Linkage

3. Place gearshift lever in "P" position and raise vehicle.
   Using a small screwdriver, unlock shift control cable by releasing
   U-shaped cable adjuster clamp. Remove cable from mounting bracket.

4. Move transmission shift lever rearward until fully
   seated into "P" detent. Ensure that driveshaft cannot be rotated.
   Snap control cable into cable mounting bracket and replace U-shaped
   cable adjuster clamp.

5. Lower vehicle and verify engine starting. Engine should
   start only with shifter in "P" or "N" position.

Rod Linkage

3. Loosen shift rod trunnion jam nuts at transmission lever.
   Remove shift rod-to-bellcrank lock pin. Disengage trunnion and shift
   rod. Place selector lever in "P" position and lock steering column.
   Move transmission shift lever to full rear Park position.

4. Adjust shift rod trunnion to obtain free pin fit in
   bellcrank arm. Tighten jam nuts. On vehicles with shift lever on
   column, make sure linkage lash is eliminated by pulling down on shift
   rod and pushing up on outer bellcrank when tightening jam nuts.

5. Check steering column lock for ease of operation. Ensure
   engine starts in "N" or "P", only. If starter engages in any drive
   gear, or does not work in "N" or "P", check for proper shift linkage
   adjustment or faulty neutral safety switch.

NEUTRAL SAFETY SWITCH

3. Switch combines functions of neutral safety switch and
   back-up light switch. With transmission linkage properly adjusted,
   switch should allow starter operation in "P" and "N" only.

4. To test switch, remove wire connector and test for
   continuity between center pin of switch and case. Continuity should

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.