A/T - New Parts and Service Information
Bulletin 86-7440-4Date
Nov. '86
Ref. No. 86-187-7440
SUBJECT: NEW PARTS AND SERVICE INFORMATION:
I. INPUT SHAFT SEAL ELIMINATED II. CONVERTER CLUTCH REGULATOR VALVE SPRING ELIMINATED
MODELS AFFECTED: 1984-1986 CENTURYS, LESABRES, ELECTRAS AND RIVIERAS WITH THM 440-T4 TRANSAXLES
I. INPUT SHAFT SEAL ELIMINATED
Service Action:
FIGURE 1 - TRANSAXLE IDENTIFICATION:
All 1986 model THM 440-T4 transaxles were built without an input shaft to 4th clutch shaft seal. When servicing a THM 440-T4 built prior to 1986, it is not necessary to replace the input shaft to 4th clutch shaft seal. Refer to Figure 1 for transaxle identification information.
Service Manual Reference:
Refer to Page 440-T4-32, Figure 34, Item 627, pre-1985 Service Manuals.
II: CONVERTER CLUTCH REGULATOR VALVE SPRING ELIMINATED
Service Action:
FIGURE 1 - TRANSAXLE IDENTIFICATION:
FIGURE 2 - VALVE BODY ASSEMBLY:
At the start of 1986 production, the converter clutch regulator valve spring (Refer to Figure 2, Item No 394) was eliminated on the following models of the THM 440-T4 transaxle: AAH, ACH, ADH, AFH, AMH, ARH, BHH, CFH, CHH, CMH, CNH, HBH and HJH, due to recalibration and fluid passage changes. Do not replace this spring on any listed model, as an increase of the apply feel of the transaxle converter clutch may result. Refer to Figure 1 for transaxle identification information.
Service Manual Reference:
Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table Of Contents for control valve assembly service information.