Thread: Triangular 4 bar set-up

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Just for review. When setting up the angles for the uppers in a triangular 4 bar, what are the most extreme angles that are acceptable? I am setting up a tri-angle 4 bar in a fairly narrow frame (26-1/4" inside). To keep from shortening the uppers too much, I need to know how far off paraelle to the frame rails does it have to be?
Next question: How close together can the two pivot points be together for the same two upper bars on the differential mount? Right now I have them tacked in place at approximately 10" between centers. I can move them closer together to obtain a longer distance between the differential mount and the frame. My only concern is that it may interfere with the differential / body clearance. That is something I can work on for clearance issues if necessary.
I was working on my project and had to have a third open heart surgery that took me out of commission for a while. I want to see this thing finished before I die.
Third question: Is there a ratio that is recommended for the length between the upper bars and the lowers?

Thanks, Ed