So, a used gear set in good shape can be set up to run quiet. The best way is to know what the pattern looked like prior to pulling them. At a minimum, having the original depth shim is of great help. But it can be done without it. I have installed a few, after watching some videos, of course.
That said, the most for your buck will be new. We never offered a warranty on used gear sets.
That said, the most for your buck will be new. We never offered a warranty on used gear sets.