Suspension - Noise From the Rear Spring Area

91chevy01

Number: 90-393-3D


Section: 3D


Date: December 1990


Corporate Bulletin No.: 063401R


Subject: REAR AUXILIARY SPRING NOISE


Model and Year: 1988-90 C2, C3 AND K3 TRUCKS


TO: ALL CHEVROLET DEALERS


THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 90-366-3D, DATED OCTOBER 1990. THE MODELS INVOLVED HAVE BEEN RESTRICTED AND VIN BREAKPOINTS HAVE BEEN CHANGED. ALL COPIES OF 90-366-3D SHOULD BE DISCARDED.


Some 1988 - 1990 C2, C3 and K3 trucks equipped with auxiliary rear springs may experience a noise from the rear spring area. This noise may be described as a slap sound and is caused when the auxiliary, or second stage springs, contact the spring stops.

Figure No. 1:

This condition can be repaired by replacing the existing spring stops and insulators with revised one piece spring stops. These revised spring stops feature insulators which are molded directly to the metal stop (Figure 1).

INVOLVED VEHICLES:


All 1988-90 C2, C3 & K3 vehicles (models C20903, C/K30903 & R05 (dual rear wheels) and C/K30953 & R05) equipped with auxiliary rear springs. These involved vehicles can be identified from other C3 & K3 models by examining the rear auxiliary spring stops (Figures 2 & 3). If the design and bolt pattern do not match those shown in Figures 2 & 3 the truck is not involved and the part numbers listed cannot be installed on the truck. Vehicles built after the VIN breakpoints listed below are equipped with the revised stops.

Ft. Wayne (Z) No Vehicles Involved

Oshawa (1) L1229961

Pontiac E (E) LE219187


PARTS INFORMATION


Part Number Description Quantity

15654886 Rear Spring Stop, Front 2

15654887 Rear Spring Stop, Rear 2

Parts are currently available from GMSPO.


WARRANTY INFORMATION


For vehicles repaired under warranty use:

Labor Operation Number: T7051

Labor Time: .6 Hr
TROUBLE CODE: 92