A/T - Consistent Shift Points and Smoothness

NUMBER: 86-B-116

GROUP: 7A - Automatic Transmission
DATE: August, 1986

SUBJECT: CONSISTENT SHIFT POINTS AND SMOOTHNESS NEW ACCUMULATOR PISTONS AND SEALS

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

THM 700-R4 Transmission Identification Information:

Beginning June 18, 1986, or Julian date 169, (refer to Figure No. 1) all 1986 THM 700-R4 transmissions are built using new 1-2 and 3-4 accumulator pistons and seals to assist in maintaining consistent shift points and smoothness.

New Pistons & Seals:

When servicing a 1982 through 1986 THM 700- R4 transmission, use the new pistons and seals (refer to Figure No. 2) which are available as

service package part number 8635909 (one piston and one seal per package). Also, the oil seal is available separately as service part number 8635568.


IMPORTANT: The same design accumulator piston and seal are used in both the 1-2 and 3-4 circuits. Refer to the appropriate service manual for removal and installation procedures.