I'm wanting to put an A3/Golf 4x4 rear axle on a MK3 Caddy van. The stock Caddy uses leaf springs. I want to convert to the above rear suspension, which has been done with some fabbing to mount the rear subframe. What I need help with, is what adjustment to add to the suspension while I'm playing, and how. For example, I need to weld in rear turrets -so how do I select the correct length and geometry for that? I know I could use the donor car shocks, but the van will weigh more and not really supposed to support my motorbike in the back either.