Abstract: A differential stabilizer arm is provided to reduce rear wheel hop on motor vehicles. A universal joint is securely fastened to the frame or cross member of the vehicle approximately three feet in front of the rear axle. Located atop the universal joint is a box-type saddle arrangement that is lined with polyethylene, also known as Hi-Fax®, to reduce the coefficient of friction. A square tube then slides in and out of this channel in a manner parallel to the centerline or drive shaft of the vehicle. At the opposite end of the square shaft is a V-shaped arm with isolated rubber brushings on the end of each of the two arms. One arm connects to the rear axle housing above the axle, and the other connects to the housing below the axle. In such a manner the invention will follow the axle as it moves through any of the three axes of movement.