1956 Pontiac transmission
Check out wilcap dot com for transmission adapters. Are you sure it is a 389? Your year car came with a 317. The 389 came out in 1959.
We replaced the motor with a 1960 389.
Same basic engine architecture.
Would the stock drive shaft work
Not likely. If it is the right length you could probably have a drive shaft shop modify it. If not they can make a new one.
If this is a hot motor you should consider a turbo 400 or a later 4 speed auto with overdrive.
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