The transmission bolts onto different bellhousings with the same bolt pattern, so just about any Hydramatic can be swapped by installing the correct bellhousing for the engine it's used with. That changed for cars in 1956 with the Controlled Coupling Hydramatic, but they were never used in trucks.
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!