Ok, that makes sense about the pic posting, I must be getting old, I seem to know less and less about computers each day. LOL!! The pinion preload most likely will not affect anything other than make the initial turn of the pinion gear more difficult. It is such a small amount of torque it is more like a drag force of rotation, Unless the pinion nut was may loose then you can move the pinion shaft/gear in and out by hand, and that will make some noise. FYI, I added a link to another site in my above post with a pic and measurement discription as well of what I was tying to explain in reguards to the pinion head measurments..