My guess would be 4.11's also, but I did not find the tag. I will look again this weekend. What I want to do is put that 400 in with an auto trans, air, power steering & brakes fora nice daily driver truck. It would be about a 50/50 mix city & interstate, so I would need comforatable speeds up to 70 mph. I would also like to switch to a 5 bolt pattern for the wheels as it seems stuff for 5 bolts are less expensive. If I could find a rear end with disc brakes I would be happy also, but not that important right now. Thanks for the input.