Start your research about 14 bolt swap here.
https://www.stovebolt.com/ubbthread.../14-bolt-axle-swap-info.html#Post1249600

You don't mention what model truck you're concerned about but there are measurements in above thread to help in any case.


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-