Complete redesign of rear suspension

I purchased some software from Speed-Wiz that analyzes suspension as well as a thousand other cool things about my race car and discovered some good things and some bad things. The good thing is that my front roll center (the point in space where the front of the car rotates when leaning into a turn) is 3" off the ground. The bad news is that my rear roll center is 14" from the ground. It's common practice to have the rear roll center a little higher than the front roll center, but an 11" difference is silly. There was no way to correct this using the triangulated 4 link suspension I had and I would never be happy leaving it as it was, so I performed massive surgery on the rear suspension.  I decided to go with a 3 link suspension and use a Woblink for locating the suspension side to side. A 3 link has the benefit of having no bind through the range of suspension travel plus I can use all the bars and rod ends I already had. The Woblink is unusual but has proven effective on live axle cars in road racing and it provides a lower roll center than either a Panhard or Watts linkage can provide. There is a video at the bottom of the page showing it in action as well as a link to the Speed-Wiz website.

Here is the single top link with my newly fabricated front and rear brackets.

I decided to make new lower front brackets and move the holes farther forward, which adds length to the bars and reduces the amount that the axle moves in a forward and back direction while going through it's range of motion.

The new brackets, with the holes drilled in an arc that allows me to change bar location without having to change it's length

All three new suspension mounts welded into place.

This is the beginning of the Woblink. It is the bracket that hols the long link to the axle, and you can see it in the next picture, bolted to the axle flange.

The two brackets that hold the Woblink arms to the axle.

This is the Woblink pivot, also called a football. The top rod end attaches to the short bar going to the axle housing, the middle rod end goes to the long bar. I made the bottom pivot from thick wall tubing and added hardened steel bushings and a grease fitting. This pivot takes the side to side force of the rear suspension and becomes the roll center.

Here is the Woblink bolted to the diff.

I built the suuport that holds the Woblink in place out of 3/16" cold rolled steel plate. After this picture was taken, I removed considerably more material to take some weight out of it.

Here it is painted and installed on the car.

Note the bars bolted to the bottom of the support. They run forward under the diff and to the frame of the car, providing some stiffness to the support,

 Video of Woblink in action
Speed-Wiz website