On cars, the swap to Bendix brakes came in 1951. I'm not sure about the pickups. I worked on a 1950 2 door hardtop coupe a while back with the 235 spray oiler hydraulic lifter engine, the Powerglide trans, and Huck brakes. A real oddball!

"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!