The shudder problem has been solved, for me anyway. I think I was trying to make the problem to difficult. It was the rear u-joint. 1/2 of the joint was completely frozen up and the other side was free. Of course the rear one is the one with the most angle so it would really shake when under a load, especially in 2nd at about 1500 rpm, after that you could still feel it but it wasn't to bad. If you have this problem, if you haven't already done it,ck your u-joints. For me, it was a cheap, easy fix.