Sorry I didn't get back to you sooner, work is nuts and by the time I get home, the last thing I want to do is goof around with a computer.
Even if it is reading and commenting on my favorite subject.
I'm attaching links to instructions for a triangulated 4-link that Alston's Chassisworks sells, and while it probably isn't your specific setup, the concepts are the same for all triangulated 4-links. Setup for a 4-link isn't complicated, making the adjustments right can be though.
Check this out. See page 3 and the instructions for locating the center/canted brackets on a triangulated 4-link third member.
http://www.cachassisworks.com/Attach...ons/916720.pdf
If you really want to understand how this works from a system perspective, take a look at the G-bar/G-link instructions. Jump to the section that deals with setup once it is installed.
http://www.cachassisworks.com/Attach...915804-F10.pdf
It is important to make sure that the canted-link brackets are centered relative to the center of the 3rd member housing and not centered relative to the midpoint of the gear case. If you have a factory rear end, I'm sure it is fine. But if a shop set the brackets, it might be worth checking.
Adjusting the side-to-side location of the third member is done with the canted brackets.
Adjusting the "straightness" of the axle is the done by adjusting the length of the parallel links.