I (my mechanic) discovered that if you have an aftermarket gas tank skid and aftermarket lower control arms (MT in my case) the bolt will only go in from the outside. This puts the slack in the threads toward the skid. In the process of bolting up...this will push the excess threads into the skid and force the skid toward center enough that it JUST touches the rear pinion yolk when you flex. Will cause random strange noises and polish the pinion yolk. To solve, simply cut the bolt back .5-.75" and it will allow the skid to come back outboard and prevent this rubbing. The noise (and the polished yolk) was a mystery for me for a long time, so I thought I would mention it to all of you as you build out your trucks.
