Hi, I have been chasing down what has been causing poort steering/handling in my truck. The only thing left I can figure is the gearbox. When i grab hold of the steering shaft, I can shake all the way down to the gearbox. I read a tsb one time that showed tightening the allen screw on top and then removing it to tighten it up if that doesnt work. Does it sound like my gearbox is in need of adjustment/replacement? Thanks