Cutting down 42 to 48 ford axles for a 40 ford

[skidmarks]

Has anyone had success in cutting down the later 42 to 48 axles to use in a 37 to 40 rear?

Laying them side by side it looks to be enough material unless im missing something.

I got a pile of the later axles but ran out of useable earlier one. Most of the damage is to threads.

Would be a great use for the pile i got to end up with fresh taper.threads and keyways