The GM 10.5" 14 Bolt axle is the King of Junk Yard Axles. It is also known as the GM 14 Bolt and Corporate 14 Bolt has been in use by Chevy and GMC since 1973 and features a big 10.5" diameter ring gear, pinion support, and coarse (~ 1.50") 30 spline full-floating axle shafts. They are only available in solid rear axle configurations and although they are usually found with drum brakes. Disc brake conversions are readily available along with many other aftermarket parts and upgrades. The 1996 and newer 14 Bolt axle manufactured by AAM were equipped with factory disc brakes.