Drive Line - Vibration/Droning Noise Over 60 Mph: Overview

NO: 03-01-98

GROUP: Differential/Drive Line

DATE: Mar. 27, 1998

SUBJECT:
Drive Line Vibration At Speeds Over 60 MPH

MODELS:
1997 - 1998 (XJ) Cherokee

NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH 4.0L ENGINES AND AUTOMATIC TRANSMISSIONS.

SYMPTOM/CONDITION:

A vibration may be present while driving at speeds over 60 MPH. The condition is usually accompanied by a droning noise and has a higher frequency vibration usually associated with propeller shaft speed as opposed to lower frequency vibrations associated with wheel and tire vibrations.

DIAGNOSIS:

Road test the vehicle. If the vibration is present, refer to the 1997 Cherokee Service Manual, publication number 81-370-8146, for basic diagnostic procedures to eliminate the possibility of mistaking vibration caused by other rotating components. It is important that all of the basic diagnostic procedure be performed in the following areas prior to installing the Repair Procedures parts as listed:

- Check and correct tire pressures

- Wheel and tire run out

- Drive Line angles

- Prop Shaft and yoke run out

If no problems are identified during the basic diagnostic procedures, perform the repair Procedure.





PARTS REQUIRED:

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:

Labor Operation No:
Install Shims, Bracket and Prop Shaft
13-30-02-91 1.2 Hrs.

Add for Skid Plate
13-30-02-60 0.2 Hrs.

FAILURE CODE: XX - Service Adjustment