Out back is a Moser 9-inch Ford that bolts into G-body cars. It has Moser 31-spline axles, a Detroit Locker diff, and Richmond 3.90:1 gears. The Torque Tech 3-inch exhaust system connects Flowmaster mufflers and Hooker Super Comp headers with 2-inch main pipes. Also here are Chassis Engineering shocks, Hotchkis springs, Southside Machine upper and lower control arms, and Air Lift air bags. Kirk runs the passenger side bag at 10 pounds and the driver side at 27.