GM gik i 1939 ind på forsikringsmarkedet med Motors Insurance Corporation og udviklede samme år det første succesfulde [[automatgear]], der blev leveret med GM Oldsmobile fra 1940.<ref>{{cite news | url=https://www.autoweek.com/car-life/classic-cars/a30463122/selling-the-first-successful-automatic-transmission-gms-hydramatic/ | title=Selling the First Successful Automatic Transmission: GM's Hydra-Matic | first=MURILEE | last=MARTIN | work=[[AutoWeek]] | date=6. april 2021}}</ref><ref>{{Cite news | url=https://www.hemmings.com/stories/2014/05/16/oldsmobiles-hydra-matic-first-mass-produced-fully-automatic-transmission-turns-75 | title=Oldsmobile's Hydra-Matic, first mass-produced fully automatic transmission, turns 75 | first=Daniel | last=Strohl | work=[[Hemmings Motor News]] | date=16. maj 2014}}</ref>
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