I have one AMC 20 differential with 2.73 + auburn ECTED e-locker. Used with 15,000 miles on it. I bought this as a reman from rubberduck4x4 approx 4 years ago. Theres nothing wrong with this diff, I replaced it with the same exact thing but with a ratio of 2.52 (I couldn't afford the time it would take to remove the diff, regear it for 2.52). I just have 1 of these ready to go in a box. Pretty darn good deal considering the diff (545006) is $1232 alone. This diff just needs a little cleaning but ready for installation. Ships from san francisco. $1500 + shipping or you can come pick it up.