The combined lubrication system is very important in the final drive axle, where load and or speed transferred are high, the combination of splash and force feed of lubricant is delivered to different components, like in case of heavy duty tandem drive axles . The lubricant is distributed to some parts by the revolution of the ring gear producing splash and to other more critical parts by using the oil pump through oil galleries under pressure as shown in Figure. Lubricant is splashed and pumped from the sump and provides adequate lubrication to gears, seals and bearings in the axle. Lubricant trickles down due to gravity into the sump, where it is collected again and the cycle repeats.