89 Aerostar 7.5 Posi on a 65?

Will a 1989 Aerostar's 7.5 posi internals fit in my 1965 7.5? if so, is it a bolt on swap or is there more.
 

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I believe the later model carrier is part of the axle that has an inspection plate you remove and uses metric threads. The original axle should have a removable center section and be SAE thread. Basically if you want to make that fit it would be cheaper to upgrade to a posi 8".