I went to the track Friday for the first time since installing my UMI adjustable torque arm onto my Dana S60 rear end. I thought I had followed the instructions in this video fairly well:
http://www.youtube.com/watch?v=UAQgLbhQ0uk

However. When launching I had all kinds of problems with traction. I also has some wicked wheel hop with a run or two. Do I need to try adjusting the angle down a couple more degrees? I have it set at -1 now which was recommended in the video. Any lower and I get some decent vibration (I need to get my driveshaft checked out too).

Also, to get the arm to bolt to the S60 I had to remove a chunk of the mount (see pic below), did anyone else with an S60 have to do this?

 

I always had best luck with -4 to -5 pinion angle. Sounds extreem, but it worked great. Try putting a couple more degrees to it. Eric L