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TSB 03-05-99

Axle Diagnosis

Page 4 - Repair Condition and Verify Repair

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REPAIR THE CONDITION:

Service the axle component in question. Refer to the 2000 Jeep Grand Cherokee Service Manual (81 -370-0047), Group 3 - Differential and Driveline for detailed instructions.

Before lowering the vehicle off of the hoist, inspect the lower control arms of the front axle for clearance. Check for a minimum clearance of 0.075 mm (0.003 in.) between the sill rail (frame) and the rear lower control arm attachment.

VERIFY THE REPAIR:

1).    Fully road test the vehicle in the different drive modes.

2).    If the axle sound is now rated a 7 or higher, then return the vehicle to the customer.

3).    If a whine (that has been rated lower than a 7) is still present only on a coast and if the ring and pinion gear set has been replaced, then the pinion gear depth may be adjusted.

NOTE: THIS ADDITIONAL PINION DEPTH ADJUSTMENT SHOULD ONLY BE PERFORMED IF THE RING AND PINION GEAR SET HAS BEEN RECENTLY REPLACED. THE SOUND BEING GENERATED BY THE AXLE MUST BE A WHINE THAT OCCURS ONLY DURING THE COAST DRIVE MODE.

The maximum allowed amount of pinion depth adjustment is a negative 0.051 mm (-0.002 in.). A negative pinion depth adjustment involves moving the head of the pinion gear closer to the pinion bearing and closer to the heel of the ring gear. This involves replacing the pinion gear depth shim with a shim that is 0.051 mm (0.002 in.)

thinner.

Once a pinion depth adjustment has been performed all preload and backlash adjustments must be redone.

4).    If an axle sound is still present, and is rated lower than a 7, then contact your Zone Office or the Star Center for additional assistance.

POLICY:    Reimbursable within the provisions of the warranty.

Time Allowance:
Labor Operation No.:
    03-30-02-00 Axle Noise Diagnosis - Includes road test...........A/T
    02-50-50-90 Pinion Depth - Front Axle - Adjust.....................3.2 Hrs.
    03-50-01-94 Pinion Depth - Rear Axle - Adjust......................3.2 Hrs.

FAILURE CODE:    CG - Customer satisfaction
                                 XX - Service Adjustment

 


Thanks to Bob Bergevin for supplying the TSB information

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Last Update: October 25, 1999