Re: 3/4 ton possi rear diff
If you are asking if the entire axle assembly would swap in, it should, but you would have 6 bolt rims in front and 8 in the rear.
Don't know about just swapping out the internals. I read that some are interchangeable, but you would need to know how to properly set up a differential, which isn't for the faint of heart.
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68 Chev C20- son has it now
83 K20 - bought from son
70 C20 - in progress
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