Navajo 4WD V6-4.0L OHV (1991)
Vibration Damper: Customer Interest
Drive Axle - Vibration and Resonance During Acceleration
Bulletin No.
006/92
Issued
7/10/92
Revised
Category
M
Applicable Model/s
1991 Navajo A/T
4WD
Subject
AXLE PINION NOISE/VIBRATION
DESCRIPTION
A vibration may be felt and resonance heard with automatic transmission vehicles while accelerating between 2800-3200 rpm in drive or overdrive. This
is caused by vibration from wheels and suspension components traveling into the differential assembly.
An axle pinion noise/vibration damper is available to control this condition.
If normal noise, vibration, and harshness diagnostics fail to improve these symptoms, install an axle pinion noise damper according to the installation
procedures included in this bulletin.
VIN OF PRODUCTION CHANGE
4F2CU44X*MUM08640
December 21, 1990
INSTALLATION PROCEDURE
1.
Verify that the vehicle was built after December 21, 1990 with a VIN number higher than 4F2CU44X* MUM08640.
Vehicles built prior to December 21, 1990, with a VIN number lower than 4F2CU44X*MUM08640 will require installation of the transfer case
vibration damper (part no. ZZL3 26 080) for optimum effect.
2.
Road test the vehicle to verify that the vibration and noise is in the 2800-3200 rpm range.
3.
Install damper ZZL3 26 080 on the axle pinion nose using bolts 9XB0 53 70A. Figure 1.
Torque bolts to 40-60 ft.lbs. If alternate bolts are used, coat them with Threadlock 262 (ZZL1 69 232) or equivalent.
NOTE:
