8 3/4" 489 help needed w/ solid sleeve

I've used the solid spacer twice with no issues. Can't remember how much shim I used but I'm sure it was more than .010"... Like you said you must have got a bearing or cup cutt a little off. Or maybe the spacer was even made a few thousandths too long. Can you measure it and post what it is? I have a new one setting here for my rearend project I can measure to see how they compare. Oh yeah, SG is dead on about the Motive gears. I'm not crazy about them cause their so hard to get set up to run quiet.