A/T - THM 400 Too Sensitive 3-2 Downshift

TSB 87-63 (Nov)

THM 400

PROBLEM: Too sensitive 3-2 downshift

SOLUTION: Remove 3-2 Control Valve Spring

Before removing the 3-2 control valve spring, be sure the problem is not engine vacuum related, or electrical. By removing the 3-2 control valve spring, all part throttle downshifts will be eliminated; passing gear will only occur with detent, or full throttle downshifts.




The figure indicates the spring to be removed.