A/T - THM 440-T4 New 2nd Clutch Piston Seal
88cad01Bulletin No. T-88-99
File in Group 7
Number 184
Corp. Ref. No. 777109
Date Feb. '88
SUBJECT: NEW 2ND CLUTCH PISTON SEAL - THM 440-T4
MODELS AFFECTED: 1985-1988 DEVILLES AND FLEETWOODS
1986-1988 ELDORADOS AND SEVILLES
When servicing the 2nd clutch assembly on a 1987 or 1988 THM 440-T4 transaxle use only a new 2nd clutch piston inner seal. When servicing the 2nd clutch assembly on a 1985 or 1986 THM
440-T4 transaxle, either the new seal or previous seal may be used.
FIGURE 1 - IDENTIFYING THE NEW 2ND CLUTCH PISTON SEAL:
This new seal uses a different material (Viton) than the previous seal and can be identified by its part number (8668074) molded into the lip of the seal (Item 614B, Figure 1). Beginning on October 30, 1987 (Julian Date 303), all 1988 THM 440-T4 transaxles were built using a new 2nd clutch piston inner seal.
A new seal may not be included in the Overhaul Seals and Gaskets Package, PN 8646975, or Overhaul Repair Complete Package, P/N 8646976. When servicing 1987 and 1988 models, make sure these overhaul packages contain the new seal. If they do not, order service package, P/N 8662935.