9" True-Track, complete bolt-in 31 spline unit, with used OE style single ribbed carrier, OE Pinion support, HD 1330 yoke, any stock gear ratio. A complete assembly with gears, which can be upgraded with the NASCAR pinion bearing, safety wired ring gear bolts and lightened and/or REM treated gears. NOTE: True-Tracs require specific axle lengths, so please call and speak to a Cobra representative for assistance.