A/T - Complete Repair Information/Parts Availability: Overview

Bulletin No. T 85-77
File in Group 7
Number 119
Corp. Ref. No. 8057607
Date April '85
SUBJECT: THM 440-T4 DEALER AUTHORIZED REPAIRS

MODELS AFFECTED: 1985 FRONT WHEEL DRIVE DEVILLES AND FLEETWOODS WITH THM 440-T4 TRANSAXLES

Since the introduction of the THM 440-T4 automatic transaxle, units requiring service have been replaced by the Hydra-Matic Division through the Transaxle Exchange Program. Effective immediately, the dealer technician is authorized to perform the on-car repairs (transaxle removal not required) outlined in Sections I and II of this bulletin.

FIGURE 1 - CASE SIDE COVER PARTS REFERENCE:

THM 440-T4 transaxles are to be repaired following the on-car service information contained in Section III of this bulletin, and referring to Section 7 of the 1985 Front Wheel Drive Deville and Fleetwood Service Information Manual (SIM). Perform only the service operations specified. At no time should repairs requiring transaxle channel plate removal be attempted. (Refer to page 3, Figure 1, part #24.)
IMPORTANT! REPLACEMENT UNITS WILL CONTINUE TO BE PROVIDED FOR
TRANSAXLES THAT REQUIRE CHANNEL PLATE REMOVAL, TRANSAXLE REMOVAL, OR THAT EXHIBIT ANY CONDITIONS NOT LISTED IN THIS BULLETIN. REFER TO SECTION IV.

The information on THM 440-T4 repairs is separated into four sections of this bulletin as follows:

I. On-Car Serviceable Transaxle Components (Pages 2 through 4)

II. On-Car Transaxle Component Diagnosis/Repair Procedures (Pages 5 through 7)

A. Diagnosis Procedures
B. Additional diagnosis/repair information for the following specific conditions:

1. Shift Conditions
a. Vacuum related (shift flare or slip/shifts harsh)
b. No upshifts or late upshifts
c. Harsh downshifts or upshifts

2. Viscous/Torque Converter Clutch Conditions
a. Does not release
b. Shudder

3. Fluid Leaks

III. Revised Service Information Manual On-Car Service Procedures (Pages 8 through 19)

Information in this section supplements looseleaf editions of the SIM.

A. Case Side Cover Pan R&R
B. Oil Pump Assembly R&R
C. Oil Pump Assembly Overhaul
D. Control Valve Assembly R&R
E. Transaxle Assembly R&R

IV. Transaxle Exchange Program Procedures (Page 20)