This rear end conversion kit allows you to upgrade your existing rear end on your 1955-59 Chevy and GMC truck to a Ford 9″, GM 10 or 12 bolt, Chrysler 8.75 or any 3″ diameter rear end. Can also be used as a rear axle flip kit netting you approximately 5″ drop by moving the rearend from underneath the leaf springs to the top of the leaf spring. Can obtain additional drop by running our 2″ lowering shackles in conjunction. See related items.