CAMPAIGN: OFF-ROAD BILSTEIN FRT. SHOCK ABSORBER DURABILITY

MODELS: 1988 K l5 WITH RPO Z71

General Motors has determined that some 1988 GMC K 15 Trucks equipped with off-road Bilstein front shock absorbers (RPO Z71) may have an incorrect valve in the shock absorbers.

During off-road driving, the incorrect valving causes increased loading into the shock valve which may result in premature valve wear.

To prevent the possibility of this condition occurring, it will be necessary to replace the front shock absorbers on all involved vehicles.

VEHICLES INVOLVED

Involved are certain 1988 GMC K 15 Trucks equipped with off-road Bilstein front shock absorbers (RPO Z71) within the following VIN breakpoints:

MODEL YEAR PLANT FROM THROUGH ----- ----- ---- ------- 1988 Oshawa J1512142 J1520382 Pontiac East JE504590 JE509620 FortWayne JZ504529 JZ510971

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign bulletin.

DEALER CAMPAIGN RESPONSIBILITY

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to ensure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer and arrangements made to make the required correction according to instructions contained in this bulletin.

If no owner's name and address were available to GMC Truck Division at the time of campaign initiation, the dealer will determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of Owner Letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing may contain owner names and addresses obtained from state motor vehicle registration records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to this campaign.

SERVICE PROCEDURE

Front shock absorber removal and installation procedure is given in Section 3C-1, "Front Suspension and Axle" of the 1988 Light Duty C/K Models Service Manual Supplement, X-8845.

PARTS INFORMATION

Parts are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure that these parts will be obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).

Part Number Description Quantity ------ ----------- -------- 22064020 Shock Absorber 2

WARRANTY INFORMATION

Dealers should submit a warranty claim on each vehicle completed under this campaign.

Labor Operation *Time Trouble Number Description Allowance Code ---------- ----------- --------- -------

V4390 Remove & .6 hr 96 Install Front Shock Absorbers

*For dealer to receive Administrative Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance

CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label". Each label provides a space to include the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label" only on a clean dry surface.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GMC Truck Claims processing Manual" #P 8719.

Dear GMC Truck Owner:

General Motors has determined that some 1988 GMC K 15 Trucks equipped with off-road Bilstein front shock absorbers may have an incorrect valve in the shock absorbers.

During off-road driving, the incorrect valving causes increased loading into the shock valve which may result in premature valve wear, and susbsequent shock absorber failure.

To prevent the possibility of this condition occurring, it will be necessary to replace the front shock absorbers on all involved vehicles. This service will be completed for you at no charge.

Instructions for performing this service have been sent to your GMC Truck dealer. Please contact your dealer to arrange a service date. The labor time necessary to replace the front shock absorbers in your vehicle will be approximately 35 minutes. Please ask your dealer if you wish to know how much additional time will be needed to process your vehicle.

The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid owner reply card and returning it to us.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

GMC TRUCK DIVISION GENERAL MOTORS CORPORATION

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.