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The question (s) about using a '42-48 Columbia rear end in a '36-41 keep coming up with generally the same answers. i.e. the '42-48 Columbia is to wide for the early cars, therefore the axles/housings must be cut down because the later model differential is two inches wider.
In a word, Nonsense.. modifying a '42-48 Columbia to fit under a '36-41 car, is a lot of work to accomplish nothing.
The '42-48 Columbia assembly will bolt onto the earlier banjo center section, thereby retaining the original drive line. A '42 and later rear spring will have to be used, either the original shocks or the '47-48 tube shocks can be used. An added benefit is the sway bar that the '47-48 rear ends have..
I removed the original Columbia from my '36 in 1955, replacing it with a '47-48 unit using all Ford parts of various years to bolt the whole assembly together.