07- EXC.LSD,G/R=3.. G/R=3.900. 07. Device Connecting Drive Shaft to Axle Shafts that allows For varied speeds of Wheel Rotation. G / R3.900. G / R3.900 AT&TURBO. A Single Complete Drive Axle Assembly. used on vehicles that utilize dependent Suspension systems. that includes a Differential and Drive axles to deliver Power to the wheels of a Vehicle in Order to Drive the Vehicle.