Transaxle Refinements

SEPARATOR PLATES
A revised manufacturing process for the 2/4 separator plate, L/R separator plate and UD/OD-REV clutch separator was implemented to enhance the quality and durability of the plates and related components. The new services the old. The revised process began in March of 1992.

DIFFERENTIAL ASSEMBLY
The AWD differential assembly uses a matched set 59/17 (59 for differential ring gear,17 for transfer shaft) for 1992. The new differential assembly has a 2.49 overall top gear ratio for the AWD application.

TRANSMISSION CONTROL MODULE
Reference: TSB 18-24-95

In 1992, a new TCM and valve body were introduced on 500 AY body vehicles. The new TCM allowed for EMCC of the torque converter in 3rd and 4th gears. The time the vehicle could be in EMCC mode had been extended to offer improved fuel economy during city driving. Since that time, later software updates require disabling extended EMCC operation because it will shear the transmission fluid and cause a transmission shudder condition. It is recommended that the controller be flashed with the latest software to eliminate extended EMCC operation. EMCC is also provided in second gear to minimize transaxle and engine overheat conditions. Refer to TSB 18-24-95, contained in Section Three, to determine whether the TCM should be replaced or reflashed.





VALVE BODY
Reference: TSB 21 -14-92

Two changes were made to the transaxle valve body in 1992 to prevent a reverse buzz condition. The changes were the following:
- A one millimeter notch was cut into the valve body housing in the torque converter control valve area (November 1991)
- A new valve body separator plate with reduced "T" and "Y" orifice diameters was introduced in August 1992

The procedure for the repair was to replace either the valve body or the valve body separator plate, depending on the build date of the transaxle.

Also for August of 1992, the regulator valve changed back to aluminum to provide for Electronically Modulated Converter Clutch (EMCC).





CHRYSLER COLLISION DETECTION (CCD) BUS
In 1992, vehicles began using the CCD Bus system protocol. The protocol change is simply the method of communication across the CCD Bus. The TOM designed for 1992 and later vehicles will not function properly if used on prior 1989-1991 vehicles. Service control modules with enhanced features are available for these year models.