Suspension/Drivetrain - Vibration Felt At 25 - 40 MPH

Classification: RA07-002D

Reference: NTB07-054D

Date: August 22, 2011

2004-2012 TITAN; VIBRATION AT LOW SPEED

This bulletin has been amended. The APPLIED VEHICLES section has been revised to include latest model year. Please discard all previous versions of this bulletin.

APPLIED VEHICLES: 2004-2012 Titan (A60)

IF YOU CONFIRM

A vibration is felt in the steering wheel (other than shimmy) and/or floor and/or seats when driving at a speed between approximately 25 MPH and approximately 40 MPH only.

ACTION





Use the flow chart above to determine if this bulletin applies.

If this bulletin applies, install shims between the leaf springs and rear axle spring seats as outlined in the SERVICE PROCEDURE section of this bulletin.

If this bulletin does not apply, refer to ASIST for further diagnosis.

NOTE:
This bulletin applies to vibration incidents as described above occurring at a speed between approximately 25 MPH and approximately 40 MPH only. Do NOT perform the inspection of wheel and tire Road Force Variation (RFV) for the described incident, if it should occur.

IMPORTANT:
The purpose of ACTION (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire SERVICE PROCEDURE as it contains information that is essential to successfully completing the repair.





PARTS INFORMATION





CLAIMS INFORMATION

SERVICE PROCEDURE

1. Raise the vehicle on a lift.

2. Place tall support stands under the rear axle next to the rear spring pads to support the weight.





3. One at a time, replace the four (4) rear spring clip U-bolt nuts (nuts) on each end of the axle housing with new ones.

^ At this time, install the new nuts finger tight only.





4. Using a pry bar or similar tool, spread the rear spring pad from the leaf springs as shown in Figure 2 to make room for shim installation.





5. Insert 0.5 degree axle shims between the leaf springs and rear spring pad on the driver's and passenger's sides.








NOTES:
^ Make sure the shims are installed with the tapered (thinner) end of the shim pointing toward the front of the vehicle. See Figures 3 and 4.

^ Make sure the cutout part of the shim is pushed in all the way against the leaf spring center bolt.





6. Tighten the nuts in a cross pattern in the order shown in Figure 5.

^ Torque the nuts to 120 Nm (12 Kg-m, 89 ft-lb).

7. Remove the stands and then lower the vehicle back to the ground.

8. Test drive the vehicle again to verify if the driveline vibration concern has been eliminated.

9. If the concern has been eliminated, release the vehicle to customer.

10. If the concern is still present:

a. Replace the 0.5 degree shims with 1.0 degree shims on both sides.

> To replace the shims, repeat steps 1-7.

> Make sure to use new nuts when repeating this procedure.

b. Test drive the vehicle for driveline vibration.

c. If a concern is still present, replace the 1.0 degree shims with 1.5 degree shims on both sides.

> Repeat steps 1-7.

> Make sure to use new nuts when repeating this procedure.

d. Test drive the vehicle for driveline vibration.