The 9-inch rear housing assembly also came under the Mustang from Ford. Calvert runs a 4.57:1 rear gear with lots of Strange parts, including a spool, 35-spline axles, and rear disc brakes. The Cobra Jet cars also came from the factory with this fabricated aluminum sway bar mount system from Dave Zimmerman's Team Z Motorsports. The mount bolts to the rear lower rear control arm bolt to locate a pivot point for the sway bar. Adjustments to the turnbuckle can create preload in the rear suspension.