I am trying to sort out the suspension on my AWD V8 Merkur XR4Ti. I have been drag racing it off and on for a few years and now I also want to AutoX it. I really seem to be able to spin the rear tires pretty easy even though the car is AWD. My 60ft time when launching in the 1/4 mile is nothing to write home about at about 1.7sec.

After doing a bit of research on suspension design and looking at the stock 3dr cossy rear setup I have it is rather obvious that it is not an ideal setup for drag racing The obvious thing to do is modify the rear beam to a 6 degree setup to minimize the toe and camber changes when the car squats during the launch. Which, this finally gets me to my point. Looking at the stock rear setup the trailing arm mounting points are at best level with the center of the wheels when stock and if the car is lowered at all the pivot axis of the trailing arms will be below the wheel center axis. This is bad from a traction standpoint is it actually generates pro-squat. This means that the rear suspension geometry actually helps the car squat rather then trying to resist it.

To decrease the amount of pro-squat and hopefully add in some anti-squat to make the rear bite, the trailing arm pickup points would have to be raised higher by several inches. I have scanned all of the pictures of the various versions of the "6 degree beam" and nobody seems to raise the pickup points. Why is this? It does look like the inner pivots would interfere with the floor if raised much above stock. This would require modifying the floor-pan under the rear seats a bit.

Thoughts?