Parts from several suppliers were combined into a differential axle kit for a couple of small go kart builds. Those units are sold at places such as Small Engine Parts Warehouse, and a kit can be assembled with a few modifications. Suppliers are not limited to the United States; the 100 series Peerless differential is used in common lawn mower parts and is available nearly worldwide. A differential can help turning, but front steering geometry should be addressed first for steering issues. Whether the rear uses a live axle or a differential, set the kart up for the running needs of the build.