A/T - Shudder in Reverse

NUMBER: 86-B-71

GROUP: 7A-Automatic Transmission

DATE: April, 1986

SUBJECT: SHUDDER IN REVERSE CONDITION

MODELS: 1982-86 LIGHT DUTY MODELS WITH THM 700-R4 AUTOMATIC TRANSMISSION

Some 1982 through 1986 THM 700-R4 transmissions may exhibit a shudder condition that most noticeably occurs when a medium to heavy throttle is applied after reverse gear has been selected. A new spacer plate has been released to correct this condition.

Figure No. 1 - THM 700-R4 Transmission Identification Information:

This spacer plate change was implemented during 1986 model production on a model by model basis beginning on transmission Julian Date 190 (see Figure No.. 1) for some models. The chart in Figure No. 2 lists the Julian Date the change was

incorporated for each 1986 model, the new spacer plate part numbers and codes, and the correct 1982- 1986 model applications for the new plate. The new spacer plate should be installed on any 1982-1985 model, and 1986 model with breakpoints prior to those listed in Figure No. 2, to resolve complaints of shudder in reverse. Refer to the appropriate Service Manual for the location of the spacer plate, identifying letter codes, and proper removal and installation procedures.