Sparky I found this when I Goggled "12 bolt" codes http://novaresource.org/axle.htm > Guys, does anyone know of a site that has a complete listing of GM 10 and > 12 > bolt rear axles aplications and codes---I have found a fairly complete 12 > bolt > > Thanks > Sparky > AA/_ L 2211 > Gear Grinder-SCTA