[OrrieG]

I have been following this discussion and am trying to figure out if I am missing something.

I thought the function of a 4 link was to allow the axle to move in a vertical arc, with both sides traveling together (think prostock where you want power equally distributed down to each side). The the linked photos the front 4 link is equal parallel arms with welded brackets at each end to the frame and axles. As each side moves independently vertically thru the arc won't that want to warp the axle if the other end is not moving at the same direction and rate? And over time will that cause fatigue at the welds? And you have the added forces from the turning movements.

I think it is will be a very stiff, unforgiving ride, with limited real travel that will eventually break at the weakest point. Having the frame connection fabbed similar to a leaf shackle arrangement might help.