A/T - Parts Availability: Overview
Number 85-7-13 Date 3/85Subject: THM 440-T4 DEALER AUTHORIZED REPAIRS
ALL 1985 THM 440-T4
Since the introduction of the THM 440-T4 automatic transaxle, some units have been replaced by Hydra-matic Division through the Transaxle Exchange Program. Effective immediately, the dealer technician is to perform on-car service to units that may exhibit any of the conditions listed below:
^ Shift conditions related to vacuum
^ [1][2]Torque converter clutch does not release, causing engine to stop running
^ Unit will not upshift or upshifts late
^ Fluid leaks
^ Slips on upshift, freewheels, vibrates during acceleration
^ 3-2 downshift, harsh
These conditions are to be repaired on-car (transaxle removal not required) by following the on-car service information contained here and referring to Section 7-A and the 440-T4 unit repair portion of the service manual. Perform only the service operations specified. At no time should the transaxle channel plate be removed!
IMPORTANT! REPLACEMENT UNITS WILL BE PROVIDED FOR TRANSAXLES THAT EXHIBIT ANY CONDITIONS NOT LISTED IN THIS LETTER.
The following service information is contained in this letter:
A. PRELIMINARY CHECK PROCEDURES;
B. DIAGNOSTIC INFORMATION INCLUDING THE FOLLOWING CONDITIONS:
1. Vacuum related shift conditions.
2. [1][2]Torque converter clutch will not release, causing engine to stop running.
3. Transaxle does not upshift or upshifts late.
4. Fluid leaks.
5. Slips on upshifts and downshifts; freewheels; vibration on acceleration.
6. Harsh 3-2 downshift.
C. ADDITIONAL ON-CAR SERVICE PROCEDURES.
Before servicing these, or any other conditions, complete the following preliminary check procedure.