Aluminum thirdmember with through bolt case, lightweight steel spool, pro gears, ball bearing pinion support, and MW yoke, superlight 40-spline axles with drive stud kit and Timken® wheel bearings. Housing has 4130 tubes and brace. With drilled steel disc brakes. Due to the variety of options available, please collect your dimensions, know your suspension and how it will be mounted (4-link, leaf spring, ladder bar, etc.), then call 1-866-508-6394 or contact us to place your order.