Transmission Identification

AW-4 AUTOMATIC TRANSMISSION

Transmission Identification:

The AW-4 is a 4-speed, electronically controlled automatic transmission.
The running gear consists of an oil pump, planetary gear sets, clutch and brake units, hydraulic accumulators, a valve body with electrical solenoids, and a transmission control module TCM). Cables are used to provide shift and throttle pressure control information. A park/neutral position switch permits engine starting in the Park and Neutral ranges only.
The valve body solenoids are controlled by signals from the Transmission Control Module (TCM). Signal sequence is determined by inputs from various sensors to the TCM.
Fourth gear is an 0.75:1 ratio overdrive range. First, second, third and reverse gear are conventional ranges. Third gear ratio is 1:1. A separate planetary gear set provides overdrive operation in fourth gear.

TRANSMISSION IDENTIFICATION

AW-4 Automatic Transmission:

The transmission I.D. plate is attached to the case. The plate contains the transmission serial and model numbers. Refer to the information on this plate when ordering service parts.