Transfer Case - Vibration or Moan During Acceleration

Bulletin No. 011/92
Issued 7/10/92
Revised

Category
K

Applicable Model/s
1991 Navajo A/T
4WD

Subject
TRANSFER CASE VIBRATION DURING ACCELERATION 2000-2400 RPM

DESCRIPTION

A vibration or "moan" may be audible during acceleration with the engine operating in the 2000-2400 rpm range. This problem only exists in models equipped with automatic transmissions.

An improved vibration damper has been used in production since December 21, 1990.

Vehicles produced prior to December 21, 1990 that experience this problem should have the new damper installed.

VIN OF PRODUCTION CHANGE

4F2CU44X*NUM08640 December 21, 1990

INSPECTION & REPAIR PROCEDURE

Confirm the following:

1. Verify that the noise is in the 2000-2400 rpm range when accelerating.





2. Verify that the damper mounted on the rear of the transfer case has a white stripe painted on the edge of the mounting plate. Figure 1.

NOTE:
This may require removal of the vibration damper because the stripe may be facing the transfer case.

3. Replace the existing transfer case vibration damper with a new damper (ZZL1 26 080). The replacement part is all black, the original part has a white stripe.

4. Attach the damper to the transfer case with new bolts (9XB0 13 80A). Tighten the bolts to 25-35 ft.lb. (34-47 N-m). If the new bolts are not available, coat the threads of the used bolts with Threadlock 262 (ZZL1 69 232).





PARTS INFORMATION





WARRANTY INFORMATION
Applies to vehicles covered under warranty.)