CAMPAIGN: DIFFERENTIAL SHAFT LOCK SCREW LOOSENING
MODELS: 1982 C,K 15 AND G15-25 LIGHT DUTY TRUCKS EQUIPPED WITH RPO G80 (8.50") EATON LOCKING DIFFERENTIAL
General Motors has determined that some 1982 C,K15 and G15-25 Series Light Duty Trucks equipped with 8.50" Eaton locking differentials (RPO G80) may exhibit a condition whereby the differential lock screw or differential pinion shaft could come loose and damage the rotating parts of the rear axle.
VEHICLES INVOLVED
Involved are certain 1982 C,K15 and G15-25 Series Light Duty GMC Trucks equipped with RPO G80 (8.50") Eaton locking differential assembled at the following assembly plants within these parameters:
Plant From Through ----- ---- ------- St. Louis Start Of Production CS517267 Janesville Start Of Production CJ509531 Lordstown Start Of Production C7504427 Flint #1 Start Of Production CF709647 Flint #2 Start Of Production CF516834 Oshawa Start Of Production C1527899 Scarborough Start Of Production C4516657 Fremont Start Of Production CZ501619
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 new or used vehicle inventory or 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 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 & Coach 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 & Coach Division of General Motors Corporation 101 Union Street Plymouth, Michigan 48170
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by GMC Truck & Coach 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
1. Raise vehicle on hoist.
2. Clean all dirt from around carrier cover.
3. Drain lubricant from carrier by removing cover.
4. Rotate the case to the position shown in Figure No. 1. Support the differential pinion shaft so that it cannot fall into the case and remove the differential pinion shaft lock screw and discard.
5. Clean the case assembly of any excessive lubricant in the threaded area of the lock screw hole.
6. Install new lock screw, P/N 14056196, and torque to 25 ft. lb.
7. Clean the carrier and cover of any old gasket material.
8. Install new gasket, P/N 3993593, and torque cover attaching bolts to 20 ft. lbs. Torque carrier cover bolts in a clockwise pattem to insure uniform draw on cover gasket.
9. Fill axle with 4.2 pints of lubricant, P/N 1052271 (24 oz. container) or P/N 1052272 (15 gal. container).
10. Lower Vehicle. Vehicle must remain stationary for at least two (2) hours following servicing involving lock screw installation to insure curing of adhesive on screw threads. However, vehicle can be moved from service area to an onsite parking area if such driving is moderate and performed imme- diately after completion of axle servicing.
PARTS INFORMATION
Parts required to complete this campaign are to be obtained by the dealer from your Warehousing and Distribution Division of General Motors.
Quantity Part Number Per Vehicle Description ----------- ----------- ------------ 14056196 1 Pinion Shaft Locking Screw 3993593 1 Cover Gasket 1052271 or 4.2 Pints Lubricant 1052272
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 ------ ----------- ---- ---- V1400 Replace pinion 0.5 Hr. 96 shaft lockscrew according to the instructions contained in this bulletin.
*For the 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 Truck Owner:
General Motors has determined that some 1982 C, K15 and G15-25 Series Light Duty Trucks equipped with 8-1/2" Eaton locking differentials (RPO G80) may exhibit a condition whereby the differential lock screw or differential pinion shaft could come loose and damage the rotating parts of the rear axle.
To prevent the possibility of this occurring on your truck, your GMC Truck Dealer will replace the differential shaft lock screw. The labor time required to perform this modification is approximately 2-1/2 hours. This service will be completed at no charge to you. Please allow additional time for the dealer to process your vehicle.
Instructions have been sent to your dealer. Parts will be available approximately October 20, 1982. Please contact your dealer on or after this date to arrange a service date to have this modification performed.
The enclosed owner reply card identifies your truck. 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.
