CHEV/GMC TRUCK SERV. BULL. PUBLICATIONS WILL BE JOINT

EFFECTIVE WITH THIS BULLETIN, NUMBER 87-T-1, CHEVROLET AND GMC TRUCK WILL BEGIN PUBLISHING A JOINT TRUCK SERVICE BULLETIN THAT WILL BE APPLICABLE TO BOTH CHEVROLET TRUCK AND GMC TRUCK MODELS. CHEVROLET BULLETINS COVERING CAR MODELS WILL NOT BE AFFECTED BY THIS CHANGE. SEVERAL CHANGES WILL TAKE PLACE WITH THE ISSUANCE OF THESE NEW BULLETINS. NUMBERING SYSTEM ---------------- O THE NEW BULLETINS WILL BE NUMBERED ACCORDING TO THE LATEST MODEL YEAR OF THE VEHICLES INVOLVED IN THE BULLETIN. A BULLETIN COVERING A 1983-1985 MODEL YEAR VEHICLE WILL BECOME AN 85 BULLETIN. A "-T-" WILL BE INCLUDED IN THE NUMBER, IDENTIFYING IT AS A TRUCK BULLETIN. THE 87-T NUMBERING SYSTEM HAS BEEN STARTED WITH THIS BULLETIN, AS IT COVERS ALL MODEL YEARS, INCLUDING 1987. ANY BULLETINS WRITTEN FOR PRE-1987 MODELS WILL BE NUMBERED SEQUENTIALLY AND BY MODEL YEAR INVOLVED, ALONG WITH THE -T- DESIGNATOR. O CHEVROLET DEALERS - SINCE CHEVROLET HAS STARTED THEIR 87 NUMBERING SYSTEM (WITHOUT THE -T- DESIGNATOR), IT IS SUGGESTED THAT CHEVROLET DEALER SERVICE BULLETIN 87-02 BE SEPARATED AND INCLUDED WITH TRUCK SERVICE BULLETINS. O GMC DEALERS - THE NUMBERING OF BULLETINS WRITTEN FOR PRE- 1987 MODEL YEAR VEHICLES WILL NOT BE CONSECUTIVE AS IT HAS BEEN IN THE PAST. YOU MAY SEE GAPS IN THE NUMBERING; 85-T-200 MAY BE FOLLOWED BY 85-T-206. GROUP/UPC CODES --------------- O CHEVROLET DEALERS - ALTHOUGH THERE ARE MINOR CHANGES IN THE GROUP (UPC) LISTING, YOUR CURRENT DIVIDER TABS AND BINDERS WILL STILL BE USABLE. O GMC DEALERS - THE NEW BULLETINS WILL BE GROUPED ACCORDING TO THE UPC CODES LISTED BELOW, WHICH COINCIDE WITH THOSE CURRENTLY USED IN TRUCK SERVICE MANUALS. YOU WILL BE RECEIVING A NEW SET OF DIVIDER TABS SHORTLY. OA GENERAL INFORMATION OB MAINTENANCE AND LUBRICATION 1A HEATING AND VENTILATION 1B AIR CONDITIONING 2 FRAME-BUMPER-SHEET METAL 3 DIAGNOSIS STEERING SUSPENSION WHEELS AND TIRES 3A FRONT ALIGNMENT 3B STEERING 3C FRONT SUSPENSION 3D REAR SUSPENSION 3E WHEELS AND TIRES 4A PROPELLER SHAFT 4B REAR AXLE 4C FRONT AXLE 5 BRAKES 6 ENGINE DIAGNOSIS 6A ENGINE MECHANICAL 6B ENGINE COOLING 6C ENGINE FUEL 6D ENGINE ELECTRICAL 6E ENGINE EMISSION 6F ENGINE EXHAUST 7A AUTOMATIC TRANSMISSION 7B MANUAL TRANSMISSION 7C CLUTCH 7D TRANSFER CASE 8A CAB ELECTRICAL 8B CHASSIS ELECTRICAL 8C INSTRUMENT PANEL AND GAGES 8D WINDSHIELD WIPER/WASHER SYSTEM 9 ACCESSORIES 10 BODY SECTION WIRING DIAGRAMS DISTRIBUTION ------------ O CHEVROLET DEALERS - ALL LIGHT AND MEDIUM DUTY BULLETINS WILL CONTINUE TO BE MAILED TO CHEVROLET DEALERS. O GMC DEALERS - ALL LIGHT AND MEDIUM DUTY BULLETINS WILL CONTINUE TO BE MAILED TO GMC DEALERS. HEAVY DUTY BULLETINS WILL BE MAILED ONLY TO DEALERS WHO ARE FRANCHISED TO SELL HEAVY DUTY MODELS. O HEAVY DUTY BULLETINS FOR NON-HEAVY DUTY FRANCHISED DEALERS WILL BE AVAILABLE FOR A NOMINAL FEE THROUGH THE ADISTRA CORPORATION (ADDRESS BELOW). ADDITIONAL DIVIDER TABS (X-0044B) CAN ALSO BE ORDERED FROM ADISTRA. ADISTRA CORPORATION ATTN: GMC SERVICE PUBLICATIONS P.O. BOX 56006 PONTIAC, MI 48056-9099 ***GMC/CHEVROLET DISCLAIMER***

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.