Ok I'm having an issue. I had the rear diff apart and cleaned it up. I put it back together exactly like it was (made marks, took pics, and did all the backlash requirements etc.) When I go to put the 240 ft/lbs torque on the pinion flange nut, it pretty much stops the pinion from turning at all, like it tightened down and won't move. Do I need a new belleville washer? Other sites say you can reuse it. What am I doing wrong?