SXT, I had a carrier in my old 1971 Dana 60 rear end, but in the new ones I don't know if they have one. They used different carriers depending on the different gears -- I didn't have to change carriers when I went from 4.56 gears to 3.54 gears, but you'll have to check with Mopar to see what you need.
Also, be careful changing gears you'll need to change speedometer calibrations.
MN