I have talked to Ron off list about this rear end and I told him to check the bolt pattern and rear hole size, also to double check the number of bolts. One thing stands out though, he says there is no inspection cover. All AMCs had a cover of some sort. If it has no cover and is a 4 1/2 inch, could it be a Chryco 8 3/4. They had no cover from what I remember. I think all the Fomocos had covers. I'm not to hip on my non AMC rear ends, maybe someone can help out on IDing this odd ball. I know a lot of people have mentioned the Chryco unit as a good alternative to the 20, so maybe the PO did just that.....Russ _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com