I can remember a few Oldsmobiles and Pontiacs, and possibly some Cadillacs that got Buick Dynaflow transmissions in 53 because of the shortage of Hydramatics. Dad's shop was one of the few independents in the Nashville, Tennessee area that did automatic transmission work in the late 40's-early 50's era. His primary competition was another WW II vet, an Army mechanic who learned his trade working on the Cadillac engine-Hydramatic equipped medium duty tanks during the war.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!