For 1990-2009 cars

# SHUDDER IN REVERSE 700R4 TRANSMISSION

#### VEHICLES AFFECTED: 1982-86 THM 700-R4 Transmission

A 1982 through 1986 THM 700-R4 transmission may exhibit a Shudder condition that is most noticeable with a medium to heavy throttle apply after reverse gear has been selected. Starting on July 9, 1985, or Julian Date 190 through October 2, 1985, Date 275 (refer to Figure 1), all 1986 THM 700-R4 transmission models were built using a new spacer plate to correct this reverse shudder condition.

Install this new spacer plate on any 1982 through 1985 or before breakpoint 1986 THM 700-R4 transmission that exhibits the reverse shudder condition.

The chart on page no. 2 indicates new spacer plate part numbers, code identifications, 1986 production Julian dates and 1982 through 1986 transmission model applications for the new spacer plates.

Refer to the apropriate Service Manual for the location of spacer plate identifying letter codes and proper removal and installation procedures.

Spacer * 1986 Plate Letter Model Part Code Julian Number ID Date TRANSMISSION MODEL AND YEAR 1986 1985 1984 1983 1982

8654481 R 198 6FAM,6FJM,6MAM 5MM,5MX 4VA,4YK 3T2,3VA 9YK 6MFM,6MMM,6MRM 5TW,5VF 4Y6 3YK 6MXM,6TWM,6VKM 5VG,5VK 6YKM,6YLM,6YTM 5VL,5VZ 6YXM 5YK,5YT 5YX,5Y6

8654482 P 191 6MBM,6MCM,6MDM 5MD,5ME 4MB,4MC 3MB,3MC 9MB,9MC 6MKM,6MLM,6MNM 5MK,5ML 4MD,4ME 3MD,3ME 9MD,9ME 6WPM,6MTM,6MWM 5MP,5MR 4MJ,4MK 3MJ,3MK 9M2,9M4 6PLM,6PRM,6TAM 5MS,5MT 4ML,4MP 3ML,3MP 9M5,9M7 6TBM,6TCM,6TDM 5MW,5PQ 4MR,4MS 3MS,3MW 9TC,9TE 6TFM,6TGM,6THM 5PR,5TD 4MW,4PQ 3PQ,3TC 9TH,9TJ 6TJM,6TKM,6YFM 5TE,5TG 4TC,4TD 3TE,ETH 9TK,9TW 6YNM,6YPM,6YRM 5TH,5TK 4TE,4TG 3TK,3T7 9T5,9T6 6YWM,6YZM 5TS,5T7 4TH,4TK 3VH,3VN 9YL,9Y3 5VC,5VH 4TS,4T7 3YF,3YG 9Y4 5YD,5YN 4VH,4VN 3YN,3YP 5YP,5YZ 4YF,4YG 5Y8 4YN,4YP 4Y7,4Y8

8654483 S 198 6MHM,6MSM,6TLM 5MG,5MH 4MG,4MH 3MH,3TL 9MH,9M6 6TMM,6TNM,6TPM 5TL,5TH 4TL,4TM 3TP,3TS 9TN,9TP 6TRM,6TZM 5TZ,5T8 4TZ,4T8 3T,3T8 5VE,5VJ 4VE,4VJ 3VJ 4VX

8654484 T 190 6YCM,6YDM 5YC 4YA,4YH 3YH,3Y9 9YA,9Y6 4YW,4Y9 8654485 U 275 6YAM,6YSM 5YA

8663085 W 191 6TSM

1986 MODEL JULIAN DATE BEGINS IN CALENDAR YEAR 1985

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.