TORQUE CONVERTER CLUTCH SHUDDER(NEW CONVERTER ASSY.). GMC Truck GMC G Van 1993

REVISION: 09/02/94

THIS BULLETIN IS BEING REVISED TO ADD THE 1994 MODEL YEAR, ENHANCE CONDITION DESCRIPTION AND UPDATE THE PARTS INFORMATION FOR THE 6.5L ENGINE. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE: ----------------------------------------------------------------------

SUBJECT: TORQUE CONVERTER CLUTCH SHUDDER (NEW CONVERTER ASSEMBLY)

MODELS: 1991-1994 CHEVROLET AND GMC TRUCK C/K, R/V & P TRUCKS, G VAN

TRANSMISSION APPLICATIONS: 1991-1994 HYDRA-MATIC 4L80-E/4L80-EHD

CHEVROLET 93-114-7A GMC TRUCK 93-7A-48 GM OF CANADA 93-7A-148

CONDITION:

SOME HYDRA-MATIC 4L80-E/4L80-EHD TRANSMISSIONS MAY EXPERIENCE A TORQUE CONVERTER CLUTCH (TCC) SHUDDER CONCERN DURING APPLY AND/OR RELEASE. TORQUE CONVERTER CLUTCH SHUDDER IS A CONDITION THAT EXISTS ONLY WHEN THE TCC IS LOCKING OR UNLOCKING. TCC SHUDDER WILL USUALLY BE DESCRIBED AS A SHUDDER OR VIBRATION CONDITION WHICH CAN BE FELT IN THE TRUCK DURING TCC LOCK OR UNLOCK.

CORRECTION:

REPLACE THE CONVERTER ASSEMBLY WITH THE NEW CONVERTER ASSEMBLY.

DATE OF PRODUCTION: THE NEW CONVERTER ASSEMBLY ENTERED PRODUCTION JANUARY 11, 1993 (JULIAN DATE 011) FOR 1993 HYDRA-MATIC 4L80-E/4L80-EHD MODELS. ON JANUARY 3, 1994 (JULIAN DATE 003) THE 1994 HYDRA-MATIC 4L80-E/4L80-EHD FOR 6.5L DIESEL ENGINES (L65/L56/L57) BEGAN USING THE SAME TORQUE CONVERTER ASSEMBLY AS THE 7.4L ENGINE APPLICATION.

PARTS INFORMATION:

MODELS PART NO. ENGINE NAME 1994 1993 1992 1991 8690904 4.3L CONV. ASM. ABP, ACP ABP, ACP ABP, ACP ABP, ACP AHP ADP, AFP AFP, AHP ADP AHP AJP

8689961 5.7L CONV. ASM. BMP, BNP BSP, BUP BSP, BUP BJP, MBP BYP, BZP BYP, BZP MCP MAP, MJP MAP, MJP MLP, MXP

8690903 6.2L CONV. ASM. BAP, BJP BAP, BJP BAP, BBP BMP, BNP BMP, BNP BJP, BMP JDP, MBP MBP, MKP BNP, CAP MCP, MPP MPP CBP, CKP CRP

8689960 6.5L CONV. ASM. AMP, ANP LAP, LFP LAP, LFP TURBO BUP, BYP KKP, KLP LLP HAP, HBP KSP HCP, HFP KSP, LAP LBP, LFP LHP, LLP LUP, LYP

8689960 7.4L CONV. ASM. DLP, DNP DCP, DLP DCP, DLP DCP, DDP DPP, DRP DNP, DPP DNP, DPP DLP, DNP TMP, TPP DRP, DSP DRP, HTP DPP, DRP TWP, TXP MHP, TVP MHP, TSP DSP TXP, TWP TWP

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: K7020 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 1 ATTACHMENTS: 0

Object Number: 83154 Size: FS

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER." THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS OCCURRING 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 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.