GM 12-Bolt Rear End Rebuild - Asphault Marker. HOT ROD Staff Writer Jul 01, 2010. ... Not only will we add strength and traction, we'll also change from a 3.08 gear to a 3.73 ratio, ...

Check out the installation of a all-new iron casting GM 12 Bolt Axle, 871/48-inch-ring-gears, and much more! Here at Hot Rod Magazine.