CAMPAIGN:A/T REAR INTERN. GEAR (SUPPL. TO CAMPAIGN 92-C-17). GMC Truck GMC C Pickup

SUBJECT: 4L80-E OR 4L80-EHD AUTOMATIC TRANSMISSION REAR INTERNAL GEAR

MODELS: 1992 C/K, P30 TRUCKS AND G VANS

This Bulletin is a supplement to Campaign Bulletin 92-C-17 issued July, 1992. This bulletin should be attached to Campaign Bulletin 92-C-17. The Service Parts Information has been corrected for model DNP. Please refer to this bulletin when ordering parts.

SERVICE 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 special instruction code but order under an advise code (2).

Part Number Description Qty/Veh. ------- ---------------------------------- -------- 8687940 Rear Internal Gear Repair Package (For 1 Trans. Models: BMP, BNP, DNP, DPP, DRP, LLP, BYP, BZP)

8687939 Rear Internal Gear Repair Package (For 1 Trans. Models: ABP, ACP, AFP, AJP, BAP, BJP, MBP, MKP, MPP, BSP, BUP, MAP, MJP, MLP, MHP, DCP, DLP, HTP, TWP, TSP, LAP, LFP)

8683922 Greased Output Shaft Sleeve & Seal Assembly 1 (For C Trucks and G Vans with Trans. Models: AJP, AFP, MJP, MKP, MLP, MPP, HTP, TSP

12345881 Dexron II-E Automatic Transmission Fluid 5 Quarts

Rear Internal Gear Repair Packages (P/N's 8687940 & 8687939) consist of two layers containing the following (Order only one of these packages per vehicle depending on transmission model type. See illustration attached for location of transmission model code):

1st Layer: Center Support, Center Support Bolt, Rear Internal Gear, Pump Assembly Bolts, Filter Assembly, Converter Seal Assembly, Fourth Clutch Bolt, Small Package With Oil Fill Tube Multi-Lip Seal, Manual Shift Shaft Seal Assembly and Force Motor Feed Filter Assembly.

2nd Layer: (Under cardboard insert) Center Support Seal Rings, Pump Gasket, Pump Seal, Rear Servo Cover Gasket, and Valve-Body-To-Case Gasket.

NOTICE: The previous center support and rear internal gear must be discarded after the normal warranty retention period. DO NOT REUSE THESE PARTS.

Also, some parts in Kits 8686939 and 8687940 will not be installed as part of the procedures in this bulletin.

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.