I think this was mentioned before but I can't seem to find it, I am currently building my new ft kit and my rear gear diff locks up when I tighten the screws all the way dwn. I've tried washers and ive tried back the screws out a little bit. Backing the screws out. This seemed to help a bit but when I bolt the rear shock tower to the diff case, it binds again. Any suggestions ? I am using the screw lengths according to the manual. Thanx.