A/T - New 2nd Gear Clutch Piston Seal
87buick11 Bulletin 88-7440-1Date Dec. '87 Ref. No. 88-057-7440
Corp. Ref. No. 877109
SUBJECT: NEW 2ND CLUTCH PISTON SEAL
MODELS AFFECTED: ALL 1984-88 CENTURYS, LESABRES, ELECTRAS, RIVIERAS AND REGALS EQUIPPED WITH THM 440-T4 (ME9) TRANSAXLES
Figure 2 - Reverse Band And 2nd Clutch Assembly:
BULLETIN COVERS
Service part information on a new second clutch piston inner seal (614B) for all 1984 through 1988 vehicles equipped with a THM 440-T4 transaxle. This new seal uses a different material (Viton TM) than the previous seal and can be identified by its part number (8668074) molded into the lip of the seal (Figure 2).
Figure 1 - THM 440-T4 Transaxle Identification Information:
DATE OF PRODUCTION CHANGE (Figure 1)
October 30, 1987 (Julian Date 303), all 1988 THM 440-T4 transaxles were built using the new 2nd clutch piston inner seal (614B).
SERVICE ACTION
When servicing the second clutch assembly on a 1984 through 1986 THM 440-T4 transaxle either the new seal or previous seal may be used. However, when servicing the second clutch assembly on a 1987 or 1988 THM 440-T4 transaxle, only use the 2nd clutch piston inner seal (614B) contained in the service package listed in the Service Parts Information section.
SERVICE PARTS INFORMATION
Service Package No. Contents
* 8662935 (1) 2nd Clutch Piston Inner Seal (614B)
(1) 2nd Clutch Piston Outer Seal (614A)
* NOTE: This seal package must be ordered when using the following overhaul packages:
- 8646975 Overhaul Seals and Gaskets Package
- 8646976 Overhaul Repair Complete Package
Figure 1 - THM 440-T4 Transaxle Identification Information:
Discard the 2nd clutch piston inner seal (614B) contained in these overhaul packages if it is not identified as shown in Figure 2)
SERVICE MANUAL REFERENCE
Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table of Contents for 2nd Clutch Assembly service information.
WARRANTY INFORMATION
For warranty purposes, when replacing the second clutch seals, use Labor Operation K7535. For this operation and to recondition the transaxle completely, refer to the appropriate Labor Time Guide for applicable labor time information.