9” Ford 35 Spline Eaton Detroit Truetrac

The Truetrac is a helical gear limited slip differential, not a “locker”. The Truetrac operates by transferring power from the spinning wheel to the wheel with the most traction. If one tire breaks traction, the amount of rotation (or spin) is controlled by transferring the lost traction to the higher traction wheel. Trutracs operate on the principle of “torque biasing”. The typical Truetrac aftermarket differential will consistently deliver approximately three-fold the torque of the slipping wheel to the gripping wheel.

9” Ford, 35-spline, 2” bearing journal. Requires 3.250” bore case. For 3.25 and up ratios