A/T - 3T40/THM 125C Forward Drum Design Changes

SIL 89-6 (Feb)

HYDRA-MATIC 3T40/THM 125C

SUBJECT: Forward Drum Changes

A new design forward drum and thrust washer entered production November 3, 1987 (Julian date 344).




The new design forward drum contains a stamped channel which increases forward clutch feed. This provides a shorter neutral to drive engagement (See figure 1).

The new design forward drum can be used in all model THM 125/125C transmissions. Whenever the new design forward drum is used1 the new design bronze thrust washer must be installed (See Figure 1).

Part number for the new design bronze thrust washer is:
8664762

If the earlier style drum is used (built prior to Julian Date 344) and the plastic thrust washer needs replacement, it may be replaced with an interim design metal thrust washer.

Part number for the interim metal thrust washer is:
8652759

Package number 8664982 includes the new design forward drum, and new design thrust washer.