Cranking up the torsion bars does have a down side in the fact that it will cause the front end components to wear at a faster rate. With this being said, am I talking about things failing in 10K miles, NO. But, the more that you crank, the higher the angles that the components work at and therefore are pushing their limits sooner. For example, with ball joints, you can hit the side of the cup, which would then shift the force from the spring supporting the weight to the metal on metal contact of the ball joint, this will lead to sudden failure of the ball joint. I had a big write up on FTW about this very thing where I had sat down and calculated the various angles of the front end with cranking the torsion bars 2 inches and what sort of effect it would have on the ride. I even cut apart a ball joint and showed the insides and what sort of angle limitations there are there.
When it comes to ride, keep in mind that with cranking the torsion bars, you are putting the suspension components more in a vertical position which is going to transfer more of the road forces directly to the frame. This is going to be hard on the rubber bushings and on the metal pieces. Like i said before though, will this lead to sudden failure, no. But, for every gain, there is a down side. Just passing on some of the info that I have gathered from playing with my truck.
