Put a 14 Semi float in place of an eaton?
I would keep the eaton in the rear. There is noway I would pull it to put a 14 bolt Semi-floater in it's place. If the eaton ever gave up on me I would replace it with a 14 bolt Full Floater.
The ring gear diameters are as follows:
14 semi float 9.5 inches
14 Full Float 10.5 inches
Eaton Full Float 12.25 inches
Keith