CAMPAIGN: INCORRECT SPEEDO DRIVEN GEAR FROM FACTORY. GMC Truck GMC Suburban

MODELS: 1982 K25 LIGHT DUTY MODEL TRUCKS EQUIPPED WITH RPO'S LH6 (DIESEL ENGINE), MY6 (4-SPEED OVERDRIVE MANUAL TRANSMISSION), AND GT4 (3.73 RATIO REAR AXLE)

General Motors has determined that some 1982 K25 GMC Truck Light Duty Trucks equipped with RPO LH6 (diesel engine), MY6 (4-speed overdrive manual transmission) and GT4 (3.73 ratio) rear axle were assembled with the incorrect drive-driven gear and sleeve assembly.

To correct this condition, the speedometer driven gear and sleeve assemblies will be replaced in all involved vehicles.

VEHICLES INVOLVED

Involved are some 1982 K25 GMC Truck Light Duty Trucks equipped with RPO LH6 (diesel engine), RPO MY6 (4-speed overdrive manual transmission) and RPO GT4 (3.73 ratio) rear axle within the following parameters:

Plant From Through Flint CF700449 CF703450 Janesville CJ500254 CJ504676 St. Louis CS503422 CS506195 Oshawa C1510491 C1514911 Fremont 3 Units - CZ501463 CZ501486 CZ501592

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 regardless of mileage, age of vehicle, or ownership from this time forward.

Whenever a vehicle subject to this campaign is taken into your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling the vehicle.

On vehicles involved in this campaign that have been recently sold to a retail owner, where no owner's name and address were available to GMC Truck 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 General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck (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

Removal and installation procedure for replacing the driven gear and sleeve may be found in the 1982 Light Duty Truck 15-35 Series Shop Manual X-8232, on pages 7B3-2 and 7B3-3, titled "89MM Manual Transmission-Speedometer Driven Gear".

PARTS INFORMATION

Dealers are requested to order the parts required to complete this campaign from Warehousing and Distribution Division of General Motors (WDDGM).

Part Numbers Qty. Per Vehicle Description

6264903 1 "O" Ring Seal 1401867 1 Upper Seal 1362294 1 Sleeve

The following list identifies the correct speedometer driven gear to use when making this replacement.

If old gear is or tires are Procure this gear

43 teeth (purple) 7.50 R16 D 1359270 36 teeth On/Off Road (white)

44 teeth (gray) LT235/85 R16 D 1359270 36 teeth LT235/85 R16 E (white) 7.50 R16 D Hwy

45 teeth (Lt. Blue) 1359272 38 teeth LT215/85 R16 C (blue)

Warranty Information

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

Labor *Time Operation Allow- Trouble Number Description ance Code

V1590 Remove incorrect 0.3 HR 96 driven gear and install new speedometer driven gear and sleeve.

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

CAMPAIGN IDENTIFICATION LABEL

Each vehicle modified 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 ballpoint 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" issued October, 1981.

Dear GMC Owner:

General Motors has determined that some 1982 K25 Light Duty GMC Trucks equipped with RPO LH6 (diesel engine), RPO MY6 (4-speed overdrive manual transmission) and RPO GT4 (3.73 ratio) rear axle were assembled with the incorrect speedometer driven gear and sleeve assembly.

The incorrect speedometer driven gear will result in the speedometer indicating a vehicle speed which is approximately 20% slower than the actual vehicle speed. For example, when the actual vehicle speed is 50 mph, the speedometer will indicate approximately 40 mph. To correct this condition on your vehicle, your GMC Truck Dealer will install the correct speedometer driven gear and sleeve assembly. This installation will be performed at no charge to you. Please contact your dealer to arrange a service date. Instructions have been furnished to your dealer. It is estimated that the actual time necessary to perform the labor required will be approximately 20 minutes.

The enclosed Owner Reply Card identifies your vehicle. Presentation of this card to your dealer will assist them 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.

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.