First mark the pinion nut and the threads with a good marker or something, and count the threads that are showing, I also count the number of times the nut takes to turn off the thread. Undo the nut, pull the yoke, change your seal. Install the yoke, put the nut back on and tighten it down the same amount of times it took to get it off, align the marks, and your good to go. It has to be close, if its too loose, you'll know....eventually by the noise.