Drivetrain - Audible Boom/Vibration at 2,600-2,800 RPM
LTB00305NAS325 MAR 2013
SECTION: 308-07B
Audible Boom / Vibration at 2,400 - 2,800 RPM
AFFECTED VEHICLE RANGE:
MARKETS:
NAS
CONDITION SUMMARY:
Situation:
An audible boom may be heard or vibration may be felt through the floor pan or front seat at 2,400 - 2,800 rpm during medium to heavy acceleration (not during cruise or light load situations).
NOTE:
The issue is best confirmed by using Commandshift(R) manual mode and accelerating through the affected rpm range
Cause:
This may be caused by powertrain torsion mode where the transfer box is effectively twisting on the rear of the transmission.
Action:
In the event of a customer concern of the above, refer to the Repair Procedure outlined below.
PARTS:
TOOLS:
Refer to Workshop Manual for any required special tools.
WARRANTY:
REPAIR PROCEDURE:
1. Raise and support the vehicle (see Workshop Manual section 100-02).
2. Install the damper and bolt to the vacant threaded hole in the transfer case.
^ Tighten the bolt to 75 Nm (55.5 lbf ft).
3. Lower vehicle.
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