What is the torque arm for?
The torque arms main function is to secure the differential from rotating as power is applied to the rear wheel. All the forces that work on the rear wheels to make the car go forward are also working on the differential, trying to spin it in the opposite direction. Mounting the differential to the frame without a torque arm can damage the differential housing. The torque arm is the best way to eliminate hard acceleration wheel hop. A simple crossmember and mount fastened to the snout of the differential is not enough!
