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I'm getting a headache thinking about this.... <img src="/forums/images/graemlins/lol.gif" alt="" />
I think the T-bar spring rate is not linear...The difference in force needed to compress the suspension increase as you compress the suspension. When you crank the t-bar, you basically increase the force needed to compress the syspension. That's what people refer to as "preload".
Another way to look at is the resistant of the t-bar from the rest state increases as the bar is twisted is not even. As the t-bar gets cranked, more down force is needed to move the suspension downward. This translates in to stiffness.


I talked to my friend Chris (pismoboy from ttora), who used to design tbars for a major nissan aftermarket company, and he says the tbars are in the linear elastic region throughout their travel. Cranking the tbars does not exert any more torque on them at ride height. If the truck is raised 2 inches, then, yes in the last 2 inches of compression, there will be more torque on them.

BTW guys, I'm at work right now so it's kinda hard to reply to everything, but I'll do my best. Hopefully frank can help out when he has time, too.

Steve
My Website ||Gettin' off 4wheel drive club member
'93 4Runner V6 4x4 auto tranny
If you have to ask about a SAS, you're not ready for it.