Here's a 71 factory 603222-1 B dana and a strange S 60 E body dana side by side. Hard to tell from the picture but 275-60-15 would rub on the wheel lip with the B dana and not with the E
Did you swap in that rear to a 1971/72 b-body?
No
The b-body dana was in my 70 Cuda when I bought it. Since that dana is a trac lock and I'm running 600hp it wasn't safe for that HP. Since it was a rare factory dana I was better off selling it and using the funds to buy the stronger S60 for an E-body. So I took the S-60 off the pallet put the b-body dana on it and shipped it to Canada where a member did install it in a 71 hemi charger.
