So the 3rd member is off center is what you are saying?
I measured everything off of the axle flanges before I had it shortened and set all my brackets off of the flanges. So I could see the 3rd member off by that much being that the mopar drivetrain sets to the passenger side. Remember all my measurements were taken off of the Flange and I never checked the 3rd member if it was center or not.
Here are the shocks I used.
130lb springs.
http://www.summitracing.com/parts/CMB-15-0058/