Intermediate Reduction Drive
Drive is transmitted from the transmission to Intermediate Reduction Drive (IRD) primary shaft via the splined hub in the transmission final drive gear carrier. See Fig 1 . The drive is then transmitted from the primary shaft gear, which is integral with the primary shaft, to the laygear which in turn drives the differential for the front axle shafts, and via a bevel drive gear and pinion to drive the rear axle. The intermediate shaft passes through the center of the IRD primary shaft, and is the drive link between the IRD differential, and the left-hand front axle shaft, passing through the center of the final drive carrier.