SOFT LOWER CONTROL ARM ATTACHMENT NUTS

Subject: PRODUCT SAFETY CAMPAIGN 91C04 SOFT LOWER CONTROL ARM ATTACHMENT NUTS

Model and Year: 1991 S/T TRUCKS (SHREVEPORT ASSEMBLY PLANT ONLY - PLANT CODE "8")

To: All Chevrolet Dealers

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to repair within sixty (60) days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule an appointment with each owner and to repair their vehicle as soon as possible. As you will see in reading the attached copy of the letter that is being sent to owners, the owners are being instructed to contact the Chevrolet Customer Assistance Center if their dealer does not remedy the condition within five (5) days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed on how to contact the National Highway Traffic Safety Administration.

DEFECT INVOLVED

General Motors has determined that a defect which relates to motor vehicle safety exists in certain 1991 S/T model trucks built at the Shreveport Assembly Plant. These trucks may have nuts, used to attach the lower control arms, rear spring and shackle, and rear shock absorbers, which do not meet specifications. It is possible for the nut to "strip" prior to or at the specified torque, resulting in a loss of clamp load. If clamp load were lost on a lower control arm attachment, the arm could detach resulting in loss of vehicle control and a vehicle crash without prior warning.

To prevent this condition from occurring, dealers are to replace all of the suspect lower control arm attachment nuts. Additionally, for customer satisfaction, all suspect rear spring and shackle, and rear shock absorber nuts will be replaced.

VEHICLES INVOLVED

Involved are certain 1991 S/T model trucks built at the Shreveport Assembly Plant built within the following VIN breakpoints:

PLANT YEAR MODEL PLANT CODE FROM THROUGH

1991 S/T Trucks Shreveport "8" M8180343 M8180549

Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.

These listings 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 the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of owner letter included with this 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 be sure 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.

PARTS INFORMATION

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To ensure 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 on an advise code (2).

Quantity/ Part Number Description Vehicle ----------- ----------- ------------- 11500748 Nut (14MM) S Trucks = 10 T Trucks = 12

SERVICE PROCEDURE

1. Raise the vehicle on hoist.

2. Identify the type of front and rear suspension and, using Figures 1, 2 and 3 on pages 4-6, replace the identified 14MM fasteners one at a time.

NOTICE: DO NOT REMOVE ALL IDENTIFIED FASTENERS AT ONCE, AS THIS MAY CAUSE A CHANGE IN SUSPENSION ADJUSTMENT.

3. Install Campaign Identification Label.

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 a 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.

CLAIM INFORMATION

Submit a Product Campaign Claim with the information indicated below:

FAILED PARTS CC-FC LABOR LAB OTH REPAIR PERFORMED PC PART NO. ALLOW OP HRS HRS ----------------- --- -------- ----- ------ ----- --- ----- Remove and Replace All Involved Nuts 10 11500748 ** SK-00 V6420 0.5 0.1 - S Truck

Remove and Replace All Involved Nuts 12 11500748 ** SK-00 V6421 0.7 0.1 - T Truck

* Campaign Administrative Allowance. Add 0.2 hrs. for vehicles equipped with skid plates as needed after obtaining Wholesale Authorization "'Eve.

** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 30% of all parts required for the repair.

Dealers will automatically receive the correct labor and material allowance based on the labor operation performed.

Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.

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.