Actually, at ride height the lower bars are parrallell to ground and parallell to the chassis centerline. The upper links angle down towards the front of the car to give us our intersect/instant center (angle determined by suspension calculator)
So the frame mounts of the upper triangulated links are lower than the diff bracket mounts. The bars are actually less than 60 degrees triangulated too. We tried to give less angle for less bind (due to the air ride sweep) without sacrificing lateral control.
Everything seems to work on the computer, and it works well throughout the air ride sweep when assembled.
I always find air ride cars are a bit of a sacrifice to geometry.
The length on our upper bars are just shy of 75 percent of our lower links. We had to make the lower bars a bit longer so we could put the frame mount in a suitable place.
In this case it was all about working around the chassis, unlike some builds were whe can build the chassis around suspension.
Hope it helps. There is some great insight and comments in your suspension thread, I posted there too.
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