Transfer Case: Description and Operation

Transfer Case





The transfer case system consists of a power transfer unit, rear driveshaft, coupling device and rear axle. The power transfer unit is a gearbox that attaches to the transaxle. The right hand halfshaft engages to the transfer case link shaft, which engages to the differential side gears as in a normal 4x2 applications. The transfer case provides power to the driveshaft through a helical gear spline coupled to the transaxle differential case, a helical gear drop (idler gear) and hypoid/helical ring gear assembly and pinion set. Repair of the transfer case is limited to seals and gaskets. If any of the geared components, tapered roller bearings, case cover or internal shafts fails, a new transfer case must be installed. The transfer case is sealed from the transaxle and has its own sump. The transfer case uses SAE 75W140 synthetic gear lubricant. The transfer case fill plug is located on the top of the casing under the transfer case mounting bracket.