Ford 9" TwinTrac 3rd Member Assembly, 28 Spline, 3.70 Ratio Currie Sportsman 9-inch nodular iron gear case with 3.062 bore carrier bearings for 28-spline axles Nodular iron big bearing pinion support 1330 series short nodular iron pinion yoke Timken master bearing kit with seals and solid pinion spacer Fully assembled and set up in-house by skilled professionals NEVER run a synthetic oil in a Currie rear end! See CE-9013 for a quality petroleum based oil option.