Transmission System Description and Operation: General Description

The Aisin AR5 is a 5 speed transmission with 5th gear being an overdrive ratio. All gear positions are synchronized. There are two versions of the AR5, RWD and 4WD. The operation is the same for both transmissions. The differences are the RWD has a longer extension housing and output shaft. In addition, the RWD has a speed reluctor wheel on the output shaft for the vehicle speed sensor. The transmission uses 4 aluminum housings. The clutch housing is removable. Roller ball bearings support the input shaft, countershaft, and output shaft. No shimming is required. For proper set up, select thickness retaining rings are used. All of the speed gears use needle bearings. The AR5 uses a special 75W-90 transmission fluid. Lubrication to the input and output shafts are by splash. An oil receiver at the rear of the countershaft lubricates the 5th gear synchronizer and bearing. On the RWD transmission, an oil trough delivers transmission fluid to the rear bushing.