A/T - Service Parts, Unit Repair Information & ID
Bulletin: 85-7440-8Date: May 1985
Ref. No.: 85-250-7440
SUBJECT: THM 440-T4 TRANSAXLE SERVICE PARTS AND UNIT REPAIR INFORMATION
MODELS AFFECTED: ALL 1985 AND 1985 1/2 MODEL THM 440-T4 TRANSAXLES
Hydra-matic is releasing three new 1985 1/2 THM 440-T4 transaxle models to replace the current 1985 models as indicated below. The 1985 1/2 models have a redesigned control valve assembly with a new 3-2 line control valve that makes the 3-2 downshift more responsive to throttle position. The oil passages in the control valve assembly, channel plate, spacer plate, and gaskets have also changed.
1985-1985 1/2 MODEL IDENTIFICATION
1985 MODEL --- Replaced By --- 1985 1/2 MODEL
BC . . .. . . . . . . . . BR
BU . . . . . . . . . . . BV
BX . . . . . . . . . . . BW
THM 440-T4 TRANSMISSION NAMEPLATE WARREN, MICHIGAN:
Service Parts Information
The 1985 1/2 model control valve assembly, spacer plate, and gaskets will not service the 1985 model. Until 1985 1/2 model part number listings are available, service replacement parts can be ordered through GMWDD by description (part name). Refer to Figure 1 for correct transaxle model identification information.
CONTROL VALVE ASSEMBLY:
CONTROL VALVE ASSEMBLY:
Unit Repair Information
The current Chassis Service Manual describes the 1985 models and will provide enough reference material to cover authorized dealer repairs for 1985 1/2 models. The exception is check ball locations. Refer to Figure 2 for control valve assembly and Figure 3 for channel plate check ball locations for the 1985 1/2 models.
Unit repair information for 1985 1/2 models will be provided in a later bulletin.
FIGURE 1