Turn3 Autosport Porsche Gearbox Rebuild Program. We have an extensive Porsche Gearbox Rebuild Program and rebuild every gearbox model throughout the range of production. Rebuild slots book up fast, so if you are thinking about getting your gearbox rebuild, give us a ring and get it booked. We also rebuild gearboxes for other shops in the industry. So, if you own/run a European shop and need gearbox building service, we can help!