CAMPAIGN: TRAILER HITCH (VR4) FASTENERS LOW TORQUE-EXT. CAB. GMC Truck GMC C Pickup

MODELS: 1989 CK 15-35 EXTENDED CAB MODELS WITH VR4 (OSHAWA ONLY)

The National Traffic and Motor Vehide 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 adequately repair within 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 appointments with owners and to repair their vehicle as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owner is being instructed to contact the nearest GMC Zone Office if the dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed 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 1989 CK 15-35 extended cab model trucks produced at the Oshawa Truck Assembly Center. These vehicles may have below specified torque on the optional trailer hitch (VR4) attaching fasteners. This incorrect torque could allow the trailer hitch to move under towing loads. This could eventually lead to failure of the fasteners. If this occurs while a trailer is being pulled, the hitch and trailer could separate and a vehicle crash could occur without prior warning.

Vehicles Involved

Involved are certain 1989 CK 15-35 extended cab model trucks with optional trailer hitch (VR4), built at the Oshawa Truck Assembly Center and built within the following VIN breakpoints:

Model Year Model From Through ---- ----- ---- ------- 1989 CK K1500029 K1519142

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. Dealers are to correct all affected vehicles in new and used vehicle stock prior to their sale.

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 correcction 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 cor- rection 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. n 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, MI 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 vehide 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

1. Inspect the trailer hitch platform (1) underneath the vehicle frame for signs of movement as evidenced by scrape or scrubbing marks on the frame and by physically attempting to shift the platform.

2. If no evidence of shifting is detected, torque the two (2) fastener bolts with weld nuts and the four (4) bolts with PTN's to the specified value. (80-100 Nm or 60-75 lb. ft.)

3. If evidence of shifting is detected, the fasteners must be replaced at all six fastening points, as the fasteners may be damaged.

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 spedal instruction code but order under an advise code (2).

Part Number Description Quantity ------ ------------ --------

11509421 Bolt, M12X1.75 X 40 6 15531205 Washer, M12, Special 10 11500756 Nut, Prevailing Torque, M 12 4

Warranty Information

Dealers should submit an accurately filled out Warranty Repair Order on each vehicle completed under this campaign.

Labor peration *Time Trouble Number Description Allowance Code ------ ----------- --------- ---- V5380 Inspect trailer hitch, .3Hr 96 no signs of movement, retorque fastener bolts

V5381 Inspect trailer hitch for .5Hr 96 signs of movement, replace and torque fastener bolts

* 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 dealerships "GM Truck Claims Processing Manual" #P 8819.

Dear GMC Truck Owner:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehide Safety Act.

General Motors has determined that a defect which relates to motor vehicle safety exists in certain 1989 CK 15-35 extended cab model trucks produced at the Oshawa Truck Assembly Center. These vehicles may have below specified torque on the optional trailer hitch (VR4) attaching fasteners. This incorrct torque could allow the trailer hitch to move under towing loads. This could eventually lead to failure of the fasteners. If this occurs while a trailer is being pulled, the hitch and trailer could separate and a vehicle crash could occur without prior warning.

To correct this condition, it will be necessary to inspect for evidence of trailer hitch movement, and if movement has occurred, the attaching fasteners will be replaced and tightened to the specified torque. If no movement has occurred, the attaching fasteners will be tightened to the specified torque. This service will be performed for you at no charge. Instructions for performing this service have been sent to your GMC Truck dealer. Parts are available. Please contact your dealer to arrange a service date. The labor time necessary to perform this correction will be approximately 30 minutes. Please ask your dealer how much additional time will be needed to process your vehicle.

Your GMC Truck dealer is best equipped to obtain parts and provide service to ensure your vehicle is corrected as promptly as possible. However, if you take your vehicle to your dealer on the agreed service date and they do not service this correction on that date or within five days, we recommend you contact your nearest GMC Truck Zone Office by telephone. The Zone Office will assist you and your dealer in getting your vehicle corrected. The telephone numbers of the Zone Offices are listed in your Warranty and Owner Assistance Information Manual.

After contacting your dealer and the Zone Office, if you are still not satisfied that we have done our best to remedy this condition without charge within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 400 Seventh Street, S.W., Washington, D.C. 20590, or call 800-424-9393 (Washington, D.C. residents use 366-0123).

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 safety and continued satisfaction with our products.

Object Number: 89997 Size: MF

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.