JACK RATTLES WHEN DRIVING ADD FOAM INSULATION TO JACK

MODELS: 1988 C/K 20-30 SERIES

Some 1988 C/K 20-30 series models may have jack assemblies that rattle when the vehicle is driven over rough roads. To repair this condition, the following procedure should be followed:

1. Cut two pieces of adhesive backed closed cell sponge rubber (FBMS 610 Type IB-ADH) 1-3/8" x 7/8" x 7/8" as shown in Figure No. 1.

NOTICE: FBMS 610 Type 1 B-ADH is available from suppliers of foam rubber. One such source is:

Banks Brothers Corp. 590 Belleville Pike Keary, NJ 07032 (201) 991-6117

2. Insert the foam lengthwise between the two rivets in the jack base (Figure No. 2) and between the two rivets in the jack pad (Figure No. 3). The adhesive end should contact the jack base and jack pad.

3. After foam installation, ensure that the jack is fully folded down for storage.

This condition was corrected in production be- ginning with the following VIN breakpoints:

GMC JE500556 Chevrolet JE101900

GMC JZ500593 Chevrolet JZ101777

GMC J1502040 Chevrolet J1106538

Labor Op T7355 should be used when performing this repair. Repair time is 0.3 hrs.

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.