My 73 came with 3:08's in it new & all i had to do was change the gears to the 3:73's that are in there now. As long as it's a 3 series carrier you can bolt up to the 3:90's in it with no other parts . When you go to the 4 series gears then you will need a different carrier or a ring gear spacer. That has been my experience so far with changing gears.
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