GM Goodwrench Automatic Transmissions Each GM Goodwrench remanufactured automatic transmission passes a series of rigorous tests before it goes into your GM vehicle. GM Goodwrench remanufactured transmissions are calibrated for your specific late-model GM vehicle to maintain its original ride performance. And new engineering enhancements are incorporated into GM Goodwrench remanufactured transmissions, to ensure years of trouble-free operation—backed by a 36-month/100,000 mile transferable limited warranty. GM Goodwrench remanufactured transmissions are available at nearly 7,000 GM Dealers across the U.S. and Canada. GM Parts Manual Transmissions and Transfer Cases Every new GM Parts Manual Transmission and new Transfer Case is engineered to OEM specifications, designed to fit and operate perfectly right from the start. GM Parts Manual Transmissions and new Transfer Cases come with a 12-month/12,000 mile transferable limited warranty—so you can be assured you’re getting the same quality that came with your new vehicle. Selected transfer case models are also available as remanufactured and offer a 24-month/24,000 mile transferable limited warranty.