A little help? Modeling rear roll steer for 2 link

[exwestracer]

I started a new thread on this because it doesn't specifically relate to the torque arm suspension. I figured there might be a wider interest in this info, but one constraint will apply only to the torque arm.

Here's what I need help modeling: Roll steer (total axle length skew) for a 58" track width axle as lower link mounts move closer to axle C/L height. 3" up/down travel at end of axle (pure roll). Assume no influence from any other linkage. R/C centered in chassis and at axle C/L height. Links level, parallel to chassis C/L and 42" apart C to C. Rear link mount at axle C/L.



Case 1: Lower links 20" long and 5" below axle C/L height.
Case 2: 18" and 4" below.
Case 3: 15" and 3" below.
Case 4: (torque arm only) 12" and 0" below axle C/L height (front mount same distance from axle C/L as case 3, shorter links to accommodate mounting on front of axle tube).

What I am trying to figure out is how the roll steer will be affected by moving the links up while still maintaining reasonable frame construction/rear seat room.

Thanks in advance.