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The transmission is conventional (mainshaft meshed with countershaft), with five forward and one reverse gear. The constant-mesh, helical type forward gears are silent and synchronized for quick engagement. Reverse is a spur gear. The transmission is in four parts: the bellhousing, main case, rear housing, and shift tower.

The bellhousing is attached to the main case, is used to attach the transmission to the engine, and contains the clutch and throwout bearing.

The main case contains:

- the input shaft assembly.
- the main shaft assembly.
- the countershaft (sometimes called cluster gear or laygear).
- the first and second shift fork, third and fourth shift fork, and fork shafts for all speeds.
- the detent balls, dowels, and springs.
- the reverse switch.
- oil fill and drain plugs.
- inspection cover (oil removed).- two ball bearings for the main shaft, one double row ball bearing, and one roller bearing for the countershaft.

The rear housing contains the fifth and reverse gears, reverse shaft, fifth and reverse shift fork, main shaft rear bearing, and engaging lever. It is attached to the main case, and serves as the mounting for the shift tower. A rear supporting cross strut is also attached to the rear housing.

The shift tower contains a sliding shaft. At the front end is a dog that engages the engaging lever in the rear housing. At the rear end of the shaft is mounted a spherical bearing. Through the spherical bearing is mounted the shift lever.