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GMPT Willow Run
General Motors Powertrain2625 Tyler Rd.
Ypsilanti, MI 48198, USA
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- Transmission - 4T80E – Hydra-matic 4 speed automatic front-wheel-drive transmission
- Components - 4T65E & 4T45E
- 4T80E (Detroit – Hamtramck Assembly)
- 4T65E (Warren Transmission), 4T45E (Windsor Transmission)
The General Motors Powertrain Willow Run Site is the proud producer of the 4T80E model of the world-renowned Hydra-Matic transmission and several components for 2 other plants making transmissions for GM’s great vehicles. The total square footage of the facility is the equivalent of 110 football fields!
Located between I-94 and U.S. 12 in Ypsilanti, the Willow Run Site has major historical significance. During World War II, B-24 liberator bombers were manufactured and assembled at the facility. More than 8,685 bombers were produced at Willow Run. In 1980, then Governor William Milliken dedicated the site as an historical site for the role the employees played in World War II.
General Motors Corporation purchased the facility in 1953 when its new Detroit Transmission facility burned completely on August 12, 1953. Twelve weeks later, transmissions were being built at the Ypsilanti location! Detroit Transmissions became Hydra-Matic in 1963 and Powertrain in 1990 when GM’s engine, transmission and casting groups combined to form GM Powertrain.