Muscle Car Restorations installed the ARB Air Locker compressor behind the backseat, adjacent to the Kenwood car audio system amplifier, which we chronicled in the December 2000 issue of Mopar Muscle. Because of the multi-use characteristics of the Road Runner, we wanted the driveability of Sure Grip with the drag race reliability of a Locker. With that in mind, Jay Prosch-Jensen recommended the use of an ARB air-operated locking differential. The Australian-built Air Locker allows conversion, with a flip of the dash-mounted switch, from an open rear end to a spool. With the accompanying air compressor, you simply air up when you are finished at the strip and return the rear end to open operation.