DEDEC (an initialism of Detroit Deere Corporation) was a planned joint venture between General Motors' Detroit Diesel-Allison and John Deere & Co.. The intention was to merge both companies' medium- and heavy-duty diesel engine divisions into one firm.

1986-1987 (cancelled)

Designer:  Louis Caruso, Kim Jungoh, Lotte Heilbrunn for Ken Saco/Curt Lowey, Inc.

Typography:  Custom

Launched:  November 18, 1986

The venture was announced on November 18, 1986, with a tentative headquarters in Livonia, Michigan and projected starting date of January 1, 1987. Due to legal and financial complications though, the plan would be called off by GM on March 27, 1987.

V • T • E  General Motors

Car marquees Buick | Cadillac | Chevrolet (Corvette) | GMC (Hummer) Other assets ACDelco | Delco Remy | Ally Financial (Ally Bank) | FAW-GM (50%) | GM Canada | GM Korea (96%) | GM Specialty Vehicles | HRL Laboratories (50%) | OnStar | GM Certified Service SAIC-GM & SAIC-GM-Wuling (34%) (Baojun | Wuling) | Renaissance Center Former assets: Divested: Opel (Vauxhall) | Opel Bank1 | DirecTV | ElectroMotive | Euclid Trucks | Frigidaire | Terex | Detroit Diesel (DEDEC) | GM-AvtoVAZ (50%) | GM Uzbekistan (25%) | (UzDaewooAvto (50%)) Defunct car marquees: Acadian | Samson Tractor | Asüna | Beaumont | Bedford | BrightDrop | Cartercar | Daewoo Motors | Elmore | GM Diesel | Geo | Holden (HSV) | Hummer | LaSalle | Marquette | McLaughlin-Buick | Oakland | Oldsmobile | Passport | Pontiac | Ranger | Rodae | Saturn | Scripps-Booth | Sheridan | Statesman | Viking | Yellow Coach | Rainier | Saab | Saehan Motors | Winton | Welch Notes 1Joint venture with Stellantis.