vibration problem

original thread update. I had a few problems with a tranny leak so I pulled the tranny to put new seals in the throttle shaft and kickdown shaft and I put a new pan gasket along with a new pan and while I was in there I pulled the tailshaft and replaced the bushing.now I noticed a few scratches on the bushing but I wouldn't say it was killed. I put it all back together and my next step in the next few weeks is to pull the rearend completely out along with the housing and cut the perches off. I am going to go back with new perches and while I put it back together, I am going to re-set the pinion angle before I weld the perches back. I have been playing with shims in it and I had put a 3 degree shim in it and didnt notice too much change. I then put a 6 degree on top of it and noticed a change. so I am thinking that when Moser narrowed this rearend, they moved the perches on me. I am also going to put a new 3:55 ring and pinion back in it so if anybody needs a 4:10 ring and pinion for a 489 case, I will have a practically new one available in the next few weeks or so. I will also check the hubs back there while it is down. Thanks for all the ideas and I will update all of you in the next month or so. I have a car show to pput this in on May 5th so I have to be done by then.