K 2500 Truck 4WD V8-379 6.2L DSL (1988)
Technical Service Bulletin # 88C037B
Date: 870801
Campaign - 4-Speed M/T Locks In Reverse
NUMBER:
88-C-03
GROUP:7B - Manual Transmission
DATE:
August, 1987
SUBJECT:
4-SPEED MANUAL TRANSMISSION LOCKS IN REVERSE
MODELS:
1988 C/K 15-35 SIERRA TRUCKS EQUIPPED WITH 4-SPEED MANUAL
TRANSMISSION (RPO MM4)
General Motors has determined that the transmission and transmission shift lever in some 1988 GMC C/K 15-35 Sierra Trucks equipped with 4-speed
manual transmission (RPO MM4) could remain locked in the reverse position, due to the shift lever finger not adequately being retained in the reverse
gate. When the shift lever finger slips out of the reverse gate, the shift lever can be moved very little from this location. It is apparent to a driver that the
transmission is in reverse, because the lever is close to the normal reverse location. To correct this condition, it will be necessary to replace the
transmission cover assembly in all involved vehicles.
Vehicles, Dealer, Owner and Service
VEHICLES INVOLVED
Involved are certain 1988 GMC C/K 15-35 Sierra Trucks equipped with 4-speed manual transmission (RPO MM4) built within the following VIN
breakpoints:
Model
Year
Model
Plant
From
Through
1988
C/K 15-35 Pontiac East
SSV
JE501630
Fort Wayne
SSV
JZ500614
Oshawa
SSV
J1503799
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 fumished 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
Refer to Service Manual X-8731 Section 4, Propeller Shaft & Axles, and Section 7, Transmission and Clutch for further removal and installation
instructions.
4-WHEEL DRIVE
^
Place transfer case in 4H.
