(the 403 and THM425 transaxle were phased out and replaced with the Oldsmobile 350 and THM325 when the downsized E platform was under development.) Influences Prior to the introduction of the GMC Motor home, a handful of other manufacturers made use of a similar front-wheel drive configuration and inspired the GMC configuration. These included the Cortez Motor Home from the Clark Equipment Corporation which initially offered a four-speed manual transmission with front-wheel drive, available from 1963 to 1970 until the division was sold to Kent Industries. From 1972 to 1977, a redesigned Cortez-SD was manufactured, initially by Kent and later a group of investors, using the same Oldsmobile 455 and three-speed automatic transmission that the GMC motorhome adopted in 1973. Another parallel design was the Revcon motor home, which, starting in 1971, was an all-aluminum body front-wheel drive coach, initially with the same Toronado drive train as the later GMC. Beginning in 1978, the Revcon took on a more aerodynamic design similar to the just-canceled GMC Motor home, which included a slant nose and dual rear axle, while adopting a Chevrolet 454 engine and Turbo-Hydramatic 475 transmission. These were in production through 1990, with one coach built in 1991 using remaining components before the factory closed. References External links GMC Motorhomes International An Informational Source for the Vintage GMC Motorhomes GMC Motorhome Forum Since 2019, the mobile-friendly, rich media message board for the GMC Motorhome community. GMCers.ORG “Telling the World About the GMC Motorhome” GMCmotorhome.com “The Internet Resource for Classic GMC Motorhomes” GMC Motorhome Worldwide Registry GMC Co-Op, Orlando, Florida MGM-GMC, Montclair, California History and story of the GMC MotorHome Front-wheel-drive vehicles Motorhome Motor vehicles manufactured in the United States Recreational vehicle manufacturers Vehicles introduced in 1972