Question for you folks who may know:
I have a 46 half ton with a 235 engine in it. Currently it has the original transmission in it. My question is this, will a Muncie SM420 work in this truck? I know it will bolt up to the engine but will it work? I’m assuming the bell housing is the same as for the original 216.
I want to use it if the 4th gear is taller than the 3rd gear in my current tranny. I have yet to research those gear ratios.

Thanks for any help. Below is the transmission I’m considering.
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1946 Chevy 1/2 ton "patina" pickup with a 1953 235 engine, otherwise all stock and unmolested!