HARSH GARAGE SHIFT REVERSE TO DRIVE. Buick Riviera 1997

REVISION: 08/19/97

THIS BULLETIN IS BEING REVISED TO CORRECT A NEW CALIBRATION NUMBER. PLEASE DISCARD CORPORATE BULLETIN 77-71-60 (SECTION 7--TRANSMISSION). ______________________________________________________________________

SUBJECT: HARSH GARAGE SHIFT REVERSE TO DRIVE (INSTALL NEW VALVE BODY SPACER PLATE AND REFLASH PCM)

MODELS: 1997 BUICK PARK AVENUE, RIVIERA 1997 OLDSMOBILE LSS 1997 PONTIAC GRAND PRIX, BONNEVILLE SSEI WITH 3.8L ENGINE (VINS 1, K - RPOS L67, L36) AND HYDRA-MATIC 4T65-E TRANSAXLE (RPOS MN3, MN7)

CONDITION:

SOME CUSTOMERS OF VEHICLES EQUIPPED WITH A HYDRA-MATIC 4T65-E TRANSAXLE PRODUCED BEFORE DECEMBER 16, 1996 MAY COMMENT ABOUT A HARSH GARAGE SHIFT SOMETIMES DESCRIBED AS A DELAYED OR HARSH ENGAGEMENT FROM REVERSE TO DRIVE.

CAUSE:

THIS CONDITION MAY BE DUE TO A COMBINATION OF VALVE BODY SPACER PLATE ORIFICE SIZE AND CALIBRATION OF THIS SHIFT MANEUVER.

CORRECTION:

THE VEHICLE ASSEMBLY PLANTS STARTED PRODUCING VEHICLES WITH TRANSAXLES THAT CONTAIN AN ENHANCED GARAGE SHIFT PACKAGE ON DECEMBER 16, 1996 TO IMPROVE THE REVERSE TO DRIVE GARAGE SHIFT FEEL. IN ORDER TO CORRECT THIS CONDITION ON A CUSTOMER'S VEHICLE PRODUCED PRIOR TO DECEMBER 16, 1996 IT WILL BE NECESSARY TO INSTALL A NEW VALVE BODY SPACER PLATE WHICH HAS AN ORIFICE SIZE CHANGE AND REFLASH THE CALIBRATION IN THE PCM.

SERVICE INFORMATION VEHICLES PRODUCED BEFORE DECEMBER 16, 1996 DID NOT HAVE THIS UPDATED GARAGE SHIFT PACKAGE. WHEN THE ASSEMBLY PLANT INTRODUCED THIS CHANGE THEY CHANGED THE MODEL NUMBERS OF THE TRANSAXLE ASSEMBLIES.

WHEN SERVICING A 4T65-E TRANSAXLE FOR A HARSH GARAGE SHIFT, IT IS IMPORTANT TO NOTE THE MODEL NUMBER AND COMPARE IT TO THE CHART BELOW TO VERIFY IF THE REPAIR SHOULD BE PERFORMED.

ORIGINAL MODEL NUMBER BEFORE UPDATED MODEL NUMBER AFTER DECEMBER 1996 DECEMBER 1996 7FBB 3.8L (L67) C/G CAR 7BMB 3.8L (L67) C/G CAR 7FHB 3.8L (L36) C/G CAR 7BDB 3.8L (L36) C/G CAR 7XAB 3.8L (L67) W CAR 7HKB 3.8L (L67) W CAR 7YWB 3.8L (L67) H CAR 7MAB 3.8L (L67) H CAR

PARTS INFORMATION:

THE FOLLOWING PARTS ARE CURRENTLY AVAILABLE FROM GMSPO:

PART NUMBER DESCRIPTION 24210495 GARAGE SHIFT PACKAGE, INCLUDES NEW VALVE BODY SPACER PLATE AND GASKETS

CALIBRATION CROSS REFERENCE TABLE

BODY ORIGINAL CALIBRATION NUMBER NEW CALIBRATION NUMBER H 16231224, 16243864 16253154 16231254, 16243874 16253164 16243884 16253174 16243894 16253184 C 16231314, 16245234, 16251384, 16254064 16254694 16251394, 16254074 16254704 16245254, 16251404, 16254084 16254714 16237414, 16245264, 16251464, 16254094 16254724 16245274, 16251474, 16254104 16254734 G 16231244, 16243844 16253134 16243854 16253144 16231304, 16243814, 16253214 16255224 16243824, 16253224 16255234 W 16243754 16253194 16243764 16253204 16233704, 16253114 16255264 16253124 16255254

A PHONE CALL WILL BE REQUIRED TO PROPERLY REPROGRAM A VEHICLE WITH THE NEW CALIBRATION. CONTACT THE TECHLINE CUSTOMER SUPPORT CENTER (TCSC) AT:

ENGLISH 1 800 828 6860 FRENCH 1 800 503 3222

INFORM THE TCSC SPECIALIST THAT YOU ARE RECONFIGURING THE VEHICLE DUE TO THE CHANGES MADE TO THE TRANSMISSION.

YOU WILL NEED THE VEHICLE'S VIN AND THE NEW CALIBRATION PART NUMBER WHEN YOU CALL TCSC. TCSC WILL PROVIDE YOU WITH A SPECIAL NUMBER. THE NUMBER IS CALLED A VCI WHICH STANDS FOR VEHICLE CONFIGURATION INDEX. THIS NUMBER IS UNIQUE FOR EACH VEHICLE. THE NUMBER WILL UPDATE THE PCM WITH THE NEW CALIBRATION. TCSC WILL ALSO UPDATE THEIR DATABASE SO THAT A PHONE CALL WILL NOT BE REQUIRED AFTER YOU RECEIVE YOUR NEXT CD ROM DISC.

ONCE YOU HAVE THE NUMBER FROM TCSC, ENTER THE SERVICE PROGRAMMING SYSTEM, SELECT SPECIAL AND THEN PROGRAM BY VCI. THE CORRECT CALIBRATION PART NUMBER WILL BE LISTED ON THE SPS SUMMARY SCREEN. CONTINUE WITH THE PROGRAMMING PROCESS BY SELECTING PROGRAM.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: K6570

USE PUBLISHED LABOR OPERATION TIME PLUS AN "ADD TIME" OF 0.4 HOUR TO PCM REPROGRAMMING.

FIGURES: 0 ATTACHMENTS: 0

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.