Suspension, Rear - Bottoms Out on Bumps in Cold Weather

File In Section: 3 - Steering/Suspension

Bulletin No.: 66-34-03

Date: August, 1996

Subject:
Rear Suspension Bottoms Out in Cold Weather
(Replace Jounce Bumpers)

Models:
1995-96 Chevrolet and GMC K1 4 Door Models

Built prior to the Following VIN Breakpoints:

Model VIN Breakpoint

Chevrolet TJ347233
GMC TJ719094

Condition

An owner may report that in cold weather, when the temperature is 20° F (-7° C) or colder, the rear suspension bottoms out over some bumps.

Cause

The jounce bumper material does not adequately dampen suspension jounce when cold. A new jounce bumper has been designed that absorbs more jounce energy in cold temperatures.

Correction

Replace the jounce bumpers with the redesigned parts.

Service Procedure

1. Assemble replacement bumper assemblies, P/N 15023225, to brackets, P/N 15023224, using nut, P/N 11516072. Tighten nut to 47 Nm (35 lb ft).

2. Raise the vehicle on a hoist.

3. Remove the nuts holding the axle bumper brackets to the frame rails.

4. Install replacement axle bumper assemblies and brackets to the frame.

Tighten

Tighten nuts to 47 Nm (35 lb ft).

5. Lower vehicle.

Parts Information

P/N Description Qty.

15023225 Bumper Assembly 2
15023224 Bracket 2
11516072 Nut 2

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Op Description Labor Time

Bumper, Axle Use Published Labor
E4407 Replace Operation Time

Important:
Labor operation is coded to base vehicle coverage in the warranty system.