FIRM OR HARSH 1-2 SHIFT THM 700 R4 - P/N REVISION
Model and Year 1982-1985 THM 700-R4 TRANSMISSIONS
TO: ALL CHEVROLET DEALERS
This Bulletin supersedes information contained in 85-53, March 1985, which should now be destroyed.
Some 1982 through 1985 THM 700-R4 transmission models may exhibit a firm or harsh 1-2 shift condition. After the complaint has been verified, inspect the T.V. cable for proper operation and adjustment. (Follow the T.V. cable adjustment procedures contained in the appropriate Service Information Manual.) If the T.V. system is operating properly, a service package (see charts below) may be required to correct the condition. Adjustment of the T.V. cable will also be required after repairs have been made to the transmission.
The charts following show the model year, transmission models, service package part numbers and package contents. The highlighted transmission models and service package part numbers indicate additional information not included on the previously issued bulletin. The "NOTES" included within he chart indicate when the new parts went into production on some of the 1985 models.
Refer to Figure 1 for transmission model identification and Figures, 2, 3 and 4 for identification of the parts contained in the packages. All the parts shown in Figures 2, 3 and 4 are not included in every package, but they are shown in order to assist the technician in disassembly and assembly. Refer to the appropriate Shop Manual for part removal and installation procedures.
Firm Or Harsh 1 -2 Shift All 1982 Through 1985 THM 700-R4 Transmissions Page 2
MODEL YEAR TRANSMISSION SERVICE PACKAGE PACKAGE ---------- MODELS PART NUMBERS CONTENTS ------ ------------ -------- 1982 MB, MC, MD, ME, MH 8647974 - 1-2 ACCUMULATOR M2, M5, M6, M7, TC SPRING TE, TH, TJ, TK, TN - INSTRUCTION SHEET TP, TW, T5, T6, YA YK, YL, Y3, Y4, Y6 1983 TD, PQ 8647973 - 1-2 ACCUMULATOR VALVE SPRING - INSTRUCTION SHEET
1983 YH NOTE: REMOVE AND DISCARD CURRENT 1-2 ACCUMULATOR VALVE SPRING AND DO NOT REPLACE IT.
1983 ML, MP, MS, T2, T7 8647975 - 1-2 ACCUMULATOR VA, YF VALVE SPRING - INSTRUCTION SHEET
1983 MB, MC, MD, ME, MH 8647974 - 1-2 ACCUMULATOR MK, MJ, MW, TC, TE VALVE SPRING TH, TK, TP, TS, T8 - INSTRUCTION SHEET VH, VJ, VN, YC, YK YN, YP, Y9
1983 YG 8647976 - 1-2 ACCUMULATOR VALVE - 1-2 ACCUMULATOR VALVE SPRING - 1-2 ACCUMULATOR VALVE SLEEVE - INSTRUCTION SHEET
1983 TL,TZ 8647981 - 1-2 ACCUMULATOR VALVE SPRING - T.V. SPRING - INSTRUCTION SHEET
1984 MB, MC, MG, MH, MJ 8647974 - 1-2 ACCUMULATOR MR, PQ, TC, TD, TG VALVE SPRING TH, TM, T8, VE, VH - INSTRUCTION SHEET VJ, VN, YA, YB, YG YN, YW, Y6, Y7, Y8 Y9
1984 ML, MP, MS, T7, VA 8647975 - 1-2 ACCUMULATOR YF VALVE SPRING - INSTRUCTION SHEET
1984 MD, ME, MK, MW, TE 8647977 - 1-2 ACCUMULATOR TK, YK, YP VALVE SPRING - 1-2 ACCUMULATOR PISTON SPRING - INSTRUCTION SHEET
1984 YH 8647978 - 1-2 ACCUMULATOR VALVE - 1-2 ACCUMULATOR VALVE SLEEVE - INSTRUCTION SHEET
1984 TL, TZ 8647981 - 1-2 ACCUMULATOR VALVE SPRING - T.V. SPRING - INSTRUCTION SHEET
1985 PQ, PR, MT, MS, ML 8647975 - 1-2 ACCUMULATOR MP, T7, VC VALVE SPRING - INSTRUCTION SHEET
NOTE: - 1985 PQ, PR, MT MODELS WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 284. - 1985 MS, ML, MP, T7 MODELS WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 345.
1985 MD, ME, MG, MH, MK 8647977 - 1-2 ACCUMULATOR MM, MR, MW, MX, TD VALVE SPRING TE, TG, TK, TM, TW - 1-2 ACCUMULATOR T8, VE, VF, VG, VJ PISTON SPRING VZ, YD, Y6 - INSTRUCTION SHEET
NOTE: - 1985 "Y6" MODEL WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 035. - 1985 MD, ME, MK,MR,MW,TD,TE,TG,TK MODELS WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 150.
1985 YX 8647979 - 1-2 ACCUMULATOR VALVE - 1-2 ACCUMULATOR VALVE SLEEVE - INSTRUCTION SHEET
NOTE: - 1985 "YX" MODEL WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 254.
1985 YK 8647988 - 1-2 ACCUMULATOR VALVE SPRING - OIL SEAL RING (INNER), (2ND APPLY PISTON) - SERVO PISTON HOUSING (INNER) - 2ND APPLY PISTON - 3-2 CONTROL SPRING* - 1-2 ACCUMULATOR PISTON SPRING - INSTRUCTION SHEET
NOTE: - 1985 "YK" MODEL WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 317.
*NOTICE: THE 3-2 CONTROL SPRING IS FOR A POSSIBLE HARSH 3-2 DOWNSHIFT FEEL.
1985 VK, VL 8649962 - 1-2 ACCUMULATOR VALVE SPRING - 1-2 ACCUMULATOR VALVE - 1-2 ACCUMULATOR VALVE SLEEVE - 1-2 ACCUMULATOR PISTON SPRING - INSTRUCTION SHEET
1985 YA, YC, YZ 8649966 - 1-2 ACCUMULATOR VALVE SPRING - 1-2 ACCUMULATOR VALVE SLEEVE - INSTRUCTION SHEET
1985 YP 8649967 - 1-2 ACCUMULATOR VALVE SPRING - 1-2 ACCUMULATOR VALVE - 1-2 ACCUMULATOR VALVE SLEEVE - INSTRUCTION SHEET
1985 Y8 8649968 - 1-2 ACCUMULATOR VALVE SPRING - 1-2 ACCUMULATOR VALVE - 1-2 ACCUMULATOR VALVE SLEEVE - 1-2 ACCUMULATOR PISTON SPRING - INSTRUCTION SHEET
NOTE: - 1985 "Y8" MODEL WENT INTO PRODUCTION WITH THE ABOVE PARTS STARTING WITH JULIAN DATE 153.
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.
