Kenny W,
As I said before, You cannot swap spiders from one leggers to lockers, but You can try to locate just the spiders with the desired number of splines for the locker and do just swap then in the locker carrier.
I have seen the indication that a carrier would go from 3.07 to 3.73 in catalogs, but check it out carefully, been working with danas for a while, and occasionally I have a 3.73/1 (11/41) rear in a dart here, it does not use the same carrier as the 3.07.
