Rear suspension is specified at no more than 14 inches, so a single coilover mounted directly to the axle works just fine. The dual-rate springs seem to be stacked upside down, with the lighter coil on the bottom. Ray Currie explains: "When combined, these springs yield a rate of 100 pounds. As soon as the slider hits the stop, the upper spring is no longer active, and the lower spring has a rate of 140 pounds." A Speedway Engineering sway bar keeps body roll in check.