Wanted to confirm some information on the 8 1/4 rear end (carrier swap)!

If you are saying only one housing for dodge/mopar I need to learn about loading different bearing I guess, the low gear sets I tried in my 73 duster 8 1/4 hit the housing... hmmm.
I think this thread (The 8 1/4 thread) should be edited or deleted because its causing confusion that there are two different housings but no one can prove that. But there have been multiple people who have successfully swapped newer carriers into older housings.