Abstract: A vari-torque bar shock absorber is provided in place of solid non-flexible bars to locate and support the rear end of a racing car. The shock absorber has a torque tube with a torque rod movably mounted therein. The torque rod carries a torque plate which move together in the torque tube. First and second stop plates are removably mounted adjacent opposite ends of the torque tube. A plurality of heavy duty coil springs are removably mounted between the first and second stop plates and the torque plate. This shock absorber may be mounted either vertically or horizontally with respect to the vehicle chassis and offers lower weight, adjustability and simplicity in changing the springs and accommodates the use of a different set of springs for the different damping rates for acceleration control and another totally different rate for deceleration control.