Another bump for the ol' diff thread. I am using the J's distance collar as well. It seems now no one will sell the shims individually anymore,even though they still have it advertised that they do. Since I have access to a machine shop,I made a shim for my set-up. Still in the middle of the build,just waiting for parts and more time. A project like this does require some patience. A thumbs up to PuddyDad! He has been very helpful to me as well! Also a thumb up for Go Tuning! I had an issue with the first distance collar I bought and they exchanged without much fuss.