An experiment that I've wanted to do for some time: Roll a coil spring on a sheet with a thin layer of paint on it, then put it into a press and compress it. Have a look at what that line of paint does.
The problem with t-bars is not the bar itself. The problem with t-bars is the arc of motion of the lever arm. Since the effective lever length is always perpendicular to the direction of the force (gravity in this case) the lever length changes radically through the travel range of the suspension. This is why "cranked" t-bars ride rougher. The bar's rate hasn't changed, but the effective lever length is significantly shorter because the control arm is at a significantly different angle.
:victory:
Yes, so the force the trucks weight exerts on the torsion bar no longer affects the rotation of T-bar as it did before the bars were re-indexed, in the same scenario. So after re-indexing the torsion bar would lowering the rear mount of the t-bars a small bit help with the ride, that would get the lever arm back to perp with gravity? That seems easy enough to do. You would probably want to lower the frame mount of the lower A arm as well to get it back to a stock angle, I know the steeper angle of the A-arms make a rougher ride as well...
There are actually a few desert trucks running torsion bar rear suspensions, they are pretty wild. Change the length of the lever arm, and the torsion bar diameter and length until you find a length combo that gives you the amount of suspension travel desired...
Good discussion, I like physics and 4 wheeling :ylsmoke:
