VA1REG. VA1REG. Beam Axle Assembly. Device Connecting Drive Shaft to Axle Shafts that allows For varied speeds of Wheel Rotation. Rigid Axle Assembly. Solid Axle Assembly. VA1REG. 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.