All the Dana Corp. rear ends I've seen do not had a "third member" the ring gear comes out the rear on the carrier and the pinion gear gears comes out the rear after the carrier (center section that the axles slide into) is remove, they are independent of each other.
On the changing of the gears the Dana Corp made 3 or 4 different carriers for different ger ratios, the 3 series carrier works only on the 3:54, 3:73 and 4:10 ratio gears, the 4 series works on 4:56 up to 5:13, I think and the five series on the 5:57 and above gear ratios.
There may be some other brand carriers and spools that will work on different ratio other than I listed