Raera axle-bearing size for 72 to 76 Torino/Ranchero

Hey guys...question I need a sort of quickie answer on.
I know 1972 Torino had the small bearing axles.
I know 1976 has the big bearings.
When was the conversion, late '73 into the '74 model year?

I have a buddy who really needs a 9" housing, and I have a '76 axle under the deck and could use the money.
I also have two parts cars, a '73 GTS and a '74 Ranchero I am getting next week.
I think the GTS is a big bearing, and Iam assuming the '74 Ranchero is the same?
Just looking for help.
Thanks

sorry for the typo, it's late, and I still can't type worth a {edit}