Shaft, Gears, and Clutches

The clutches and gears are installed on the input shaft (mainshaft), the secondary shaft, the third shaft, and the idler gear shaft. These gears are in constant mesh with those on the output shaft (countershaft). When specific gears are engaged by the clutches, power is transmitted through the mainshaft, to the secondary shaft, the third shaft, the idler gear shaft, and/or the countershaft, then to the final driven gear of the differential to provide drive.