Abstract: In a driven axle assembly (12) for a motor vehicle that includes a differential housing located substantially in the center of the axle and tubes (16, 17) extending laterally from the differential, surrounding axle shafts (20) and opening into a lubricant reservoir (60) in the differential housing, a system for circulating and cooling axle lubricant includes a cover (26) for closing and sealing the housing having an aperture into the housing where a ring gear rotates through the lubricant reservoir. The aperture in the cover opens to a chamber that holds lubricant carried through the aperture by the rotating ring gear. Conduits (72, 74) connected by hydraulic fittings (76, 78) to the chamber have their opposite ends connected to the axle tubes at an outboard location distant from the differential housing. Lubricant flows through the conduits into the axle tubes and back to the housing reservoir, effectively cooling the lubricant without the addition of a pump.