I've been setting up rear gears for about 15 years now and I thought I would hone a pinion bearing for setup on my 489 chunk with a solid spacer, for the last one I did. I have always measured with my T and D pinion dept gauge and pull the bearing back off and changed shims. With my honed Timken bearing installed, and shims for 25 in lbs of pre-load, my pinion measured only -.001 of the recommended dept. I ran a pattern and it was perfect. I changed to the pressed on Timken bearing and it measured -.004 below the recommended distance and lost All of my preload.I figured it would be closer than that or at least on the + side. I adjusted the preload with shims and ran a pattern. It looked the same as before. Go figure.