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1993 Jeep Cherokee

1993 Drive Axles - Front Axles

Cherokee, Grand Cherokee, Grand Wagoneer, Wrangler

DESCRIPTION

Model 30 axle is used on all 4WD applications. Cherokee uses Selec-Trac 4WD system. Wrangler uses Command-Trac 4WD system. Grand Cherokee and Grand Wagoneer use a full-time 4WD system.

Command-Trac is a part-time system designed for off-road use. Command-Trac uses a vacuum operated axle disconnect mechanism to control 4WD operation.

Selec-Trac is a combination part-time/full-time system designed for both highway and off-road use. Transfer case shifter is used to control 4WD operation.

AXLE RATIO & IDENTIFICATION

Axle build date and manufacturer�s number are stamped on passenger-side axle tube, near housing cover. Axle assembly part number, gear ratio and identification tag are attached to the left side of the housing cover. See AXLE RATIO & IDENTIFICATION table.

AXLE RATIO & IDENTIFICATION TABLE

Axle Pinion/Ring Gear Ring Gear

Ratio Tooth Combinations Diameter

Front Axle (1)

3.07:1 14/43 7 1/8" (181 mm)

3.55:1 11/39 7 1/8" (181 mm)

4.10:1 9/37 7 1/8" (181 mm)

(1) - Model 30 axle used on all models.

REMOVAL & INSTALLATION

NOTE: This article covers removal, installation and overhaul of

front axle components. For information on differential, see 7 1/8", 7 9/16" & 8 1/4" RING GEARS article.

AXLE ASSEMBLY

Removal (Except Wrangler)

1. Raise and support vehicle under frame. Remove wheels.
   Remove disc brake calipers. Hang calipers aside with wire. Remove
   rotors and brake shields.

2. Disconnect breather tube at axle. Remove vent hose from
   differential housing. Remove stabilizer bar link, tie rod and drag
   link. Remove front drive shaft. Disconnect shock absorbers and
   steering damper. If equipped with Anti-Lock Brake System (ABS),
   disconnect brake sensor.

3. Disconnect track bar. Position jack under axle. Disconnect
   upper and lower control arms at axle. Lower and remove axle slowly to
   release coil spring pressure.

Installation (Except Wrangler)

Raise axle into position while guiding coil springs into position. Connect upper and lower control arms to axle. To complete installation, reverse removal procedure.

Removal (Wrangler)

4. Raise vehicle. Position supports under frame rails at rear
   of front springs. Remove wheels. Remove brake calipers and hang aside
   with wire. Remove brake rotors. Disconnect Command-Trac vacuum
   harness.

5. Mark front drive shaft and axle yoke for reassembly.
   Disconnect front drive shaft at axle yoke. Secure shaft to frame with
   wire. Disconnect tie rods at steering knuckles. Remove steering
   damper. Remove shock absorbers. Remove retaining nuts and bolts from
   track bars at axle shaft tube brackets. Disconnect breather tube at
   axle. Disconnect stabilizer bar link bolts at spring brackets.

6. Support axle and raise jack slightly to relieve spring
   tension. Remove spring "U" bolts and brackets. Loosen nuts attaching
   spring rear shackles to springs. Remove bolts attaching spring front
   shackles. Lower springs to floor. Remove axle assembly.

Installation (Wrangler)

To install, reverse removal procedure.

AXLE SHAFT

Removal

7. Raise and support vehicle. Remove wheels, caliper and
   rotor. Remove cotter pin, lock nut and axle hub nut.

8. Remove hub-to-steering knuckle bolts. Remove hub and rotor
   shield from steering knuckle. Remove left axle shaft from axle tube.
   On models with Command-Trac, disconnect vacuum harness. Remove vacuum
   motor housing. See Fig. 1.

9. Remove right axle shaft from axle tube. Ensure shift
   collar remains on intermediate shaft.

Fig. 1: Removing Command-Trac Shift Motor Courtesy of Chrysler Corp.

Installation

1) Install right and left axle shafts in axle tubes. On

models with Command-Trac, ensure shift collar is correctly positioned on intermediate axle shaft.

10. Ensure outer axle shaft is completely engaged with shift
    collar and joined with intermediate axle shaft. See Fig. 1. Install
    shift motor. Ensure fork engages with shaft collar.

11. On all models, lubricate hub bore in steering knuckle with
    wheel bearing grease. Install rotor shield. Install hub on axle. Slide
    hub into steering knuckle hub bore. Tighten hub bolts. Install the
    washer and the hub nut. Tighten hub nut to proper specification. See
    TORQUE SPECIFICATIONS TABLE at the end of this article. Install
    retainer and cotter pin. Install rotor, caliper and wheel. Lower
    vehicle.

INTERMEDIATE AXLE SHAFT

Removal & Installation (Wrangler)

Remove outer axle. Remove differential cover and drain fluid. Remove intermediate shaft retaining clip. See Fig. 2. Remove intermediate shaft. To install, reverse removal procedure. Fill differential housing with 2.5 pts. (1.2L) of SAE 75W-90 gear oil.

Removal

Raise and support vehicle. Remove wheel, caliper and rotor. Remove cotter pin, nut retainer, hub nut and washer. Remove hub-to-knuckle bolts. Remove hub from steering knuckle. See Fig. 3.

Installation

Apply wheel bearing grease to hub bore in steering knuckle and install hub and bearings. To complete installation, reverse removal procedure.

NOTE:

Hub bearings cannot be serviced. If defective, replace complete hub assembly.

AXLE SHAFT CV JOINT

NOTE: If worn or damaged, assembly.

CV joint MUST be replaced as a complete

marks.

Reassembly

1) Lightly oil components before reassembly. Align reference Install hub into cage. Install hub/cage into housing. Tilt cage

and insert balls into hub raceways. Push high side of hub/cage assembly into housing. Ensure assembly rotates freely in housing. Install shaft and circlip.

2) Pack bearing assembly with molybdenum base CV joint

grease. Slide boot over CV joint. Install NEW boot clamps. Check shaft and joint for smooth movement.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS TABLE

Applications

Ft. Lbs. (N.m)