rear end ratio's
 

What gear sets will fit the carrier of a dana rearend that came with 3.73s. It came in a 72 GMC 3/4 ton

is it a dana or a hd72? does it have a drop out 3rd member? if it drops out the only ratio you can get up to is a 4:10. dont know if that helps you.
Dwayne

It is aftermarket or swapped in from something else, 3.73 was not offered in 3/4 ton trucks.
It may be out of a later dodge or an aftermarket unit.

is your truck an original Big Block euipped truck?

if so, they had 3.54 gears in the dana 60 factory. otherwise, they should have 4.11 gears in a 3/4 ton. i am not sure if the 4.56 came in the dana 60 rearend, perhaps as an option. I am not sure about the gearsets you could get, I am guessing you have a 3-series carrier that will hold all 3:_ _ gears. maybe someone else can help.

the truck is an original 250, three on the tree. as far as i know the 3.73 is original