A/T - THM 440-T4 Intermittent Loss of Drive/Reverse

Bulletin No. T 87-67
File in Group 7
Number 154
Corp. Ref. No. 777104R
Date Jan. '87
SUBJECT: THM 440-T4 INTERMITTENT LOSS OF DRIVE AND/OR REVERSE

MODELS AFFECTED: 1985-1987 DE VILLE AND FLEETWOOD 1986-1987 ELDORADO AND SEVILLE

Figure 1 - Transmission I.D. Nameplate:

Figure 2 - 3rd Roller Clutch:

Some 440-T4 transaxles may experience a loss of drive and/or reverse which may be constant or intermittent, hot or cold. This condition should not be confused with delayed engagement which occurs on the first attempt to engage drive or reverse. The loss of drive condition may be caused by the input sprag clutch assembly even with normal line pressures.

This condition may be repaired by installing a new design, wider sprag clutch and related parts. 1986-1987 models built after April 1, 1986 (Julian Date 091) or a SRTA model after May 1, 1986 (Julian Date 121, see Figures 1 and 2), contain the new design wide sprag clutch and related parts. Refer to the following chart of required parts for servicing before and after number units.

Service Pkg.
Part Number Description Service Kit Notes

8646985 Sprag Assy. (With End Bearings) These 4 parts are available
Snap Rings (2) for servicing transaxles
Outer Race "at or after" those Julian
Inner Race dates listed.

8662906 Spacer, Input Sun Gear When servicing transaxles
Retainer, Input Sprag Clutch before those Julian dates
Carrier Assy., Input Complete listed, all seven (7) parts
are required and are available.

Refer to the THM 440-T4 Automatic Transaxle Unit repair manual for input sprag clutch assembly service information detail.
For warranty purposes, use T6193 for 7.2 hours.