REAR SPRING NOISE (INSTALL RUBBER RING)

Model and Year 1988-89 C1, C2, AND K1, K2 TRUCKS

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NUMBER 88-341-3D DATED OCTOBER 1988. IT WAS REVISED SO THAT THE 1989 MODEL YEAR COULD BE ADDED, A NEW PART NUMBER ADDED, AND TO CLARIFY THE SERVICE PROCEDURE. ALL COPIES OF 88-341-3D SHOULD BE DISCARDED.

Some 1988 C1, 2 and K1, 2 models may experience a noise from the rear leaf springs. This noise is more noticeable on rough roads. The cause of the noise is a metal to metal contact between the main leaf spring pack and the lower leaf spring.

This condition can be corrected by installing an insulator on the lower leaf spring. The insulator fits on the tip of the leaf and should be installed with a rubber mallet. It may be necessary to raise the vehicle by the frame to install the inserts. A strip of plastic nylon is attached to one side of the insert. This side should face up toward the remaining spring leaves.

Part Number Model Quantity ----------- ----- -------- 15604174 C1,K1 4

15604175 C2,K2 4 without 8600 GVWR

15604176 C2, K2 4 with 8600 GVWR

15604176 C3,K3 4

Parts are expected to be available on September 14, 1989. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

For vehicles repaired under warranty, use:

Labor Operation Number: T7760

Labor Time: .3 Hr

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.