Hey guys, I've been a member at other Scoin forums for quite some time, but I had to join this forum to respond to this thread.
I'm a certified Toyota tech, and I drive an '09 xB. It's long overdue, but I'm in the process of playing with my rear alignment right now. I've worn out a couple of sets of tires(my last set were Michelins), and now it's time to fix it since I'm about to put another set of Michelins on.
My rear alignment was perfect when I bought mine, new in '08. All that changed when I installed Hotchkis lowering springs. Now, I've got about .8 deg of total toe in the rear. If you know anything about alignments, that's a ton. As it is, my xB wears the rear tires out before it does front.
I specialize in steering & suspension, tires, and alignments. In my experience, these rear torsion beams are almost never defective...unless the car has been wrecked. The alignment tech has to make sure to pull the car onto the alignment rack perfectly straight. About a 20ft straight is ideal, and most guys won't(or can't due to space constraints) make the effort to do that. This causes false alignment readings as the suspension can be in a bind.
Basically, when lowered, the beam pivots upward. This causes the factory negative camber to become positive toe. Replacing the beam will rarely fix the problem, and it WILL NOT fix it if you've got lowering springs.
At our dealer, we don't deal with rear shims, but I'm trying to find out for sure which ones fit. I really don't want to tear it apart on my day off and find out the shims I've got won't work.
Last edited by xBones; 05-15-2012 at 01:53 PM.