Clunk/Pop Noise From Front of Vehicle (Shim Rear Frame/Cradle Mounts)

Some customers may comment about a clunk or pop type noise coming from the front of the vehicle. This condition can be duplicated and is most apparent during either a heavy acceleration from a stop or moderate to heavy brake apply at low speeds.

This condition may be caused by fore/aft movement of the two rear frame/cradle mounts in the frame/cradle assembly.

Install shim material contained in service kit, P/N 10306243, between the rear mounts and the frame/cradle assembly, using the following procedure:

1. Raise vehicle and support the rear of the frame/cradle assembly.
2. Remove the two rear frame/cradle mount bolts and the lower retainers.
3. Lower the rear of the frame/cradle assembly 50 mm (2 in).
4. Remove the two rear mount upper insulators.
5. Remove the two rear mount lower insulators.
6. Cut shim material contained in service kit, P/N 10306243, into four equal pieces 25 mm X 62 mm (1 in X 2½ in).



7. With the shiny surface of the shim material facing away from the mount lower insulators, position a piece of the shim material (1) on both the fore and aft surfaces of the insulators as shown in the figure.
8. While holding the shim material (1) in position, install lower insulators into the frame/cradle assembly.
9. Generously lubricate the upper insulators with rubber lubricate, P/N 12345884 and install.
10. Raise the rear of the frame/cradle assembly up to the vehicle underbody.
11. Install mount lower insulator retainers and hand start frame/cradle mount bolts.

Tighten
Tighten the frame/cradle mount bolts to 160 N·m (118 lb ft).

12. Remove the support and lower the vehicle.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: