On a tri-4 bar setup, let's say hypothetically you only used the two long bars (obviously this wouldn't work but just for the example). In that case, the axle housing would follow the radius of the ends of those links while travelling. So the axle wouldn't go straight up and down, it would curve along a radius equal to the length of the bars.
Now if we add in the triangulating bars, or any bars at all of a different length, doesn't that throw in a conflicting radius that the axle will want to follow. Now we have two different length bars controlling the axle, and not only that, the triangulating bars come into the axle at an angle, so now the radius' of the two different bars aren't even in the same plane.
How can it work when you use bars of different lengths, and therefor different radius'?
Also, does the angle of the coil over make a difference?
I'm asking this because I ordered a tri-4 bar setup and I want to make sure I have these theories straight in my head before I start cutting and welding.