Yeah, not sure how not crushing the sleeve would cause a vibration, not an optimal wear pattern maybe, not a vibration. Unless it's loose, if you can wiggle the pinion yoke, then yeah maybe.
Is the diff guy also a driveline/driveshaft shop?
If nothing else, another set of eyes should help. If the locators on the pinion yoke are boogered, this would be a good time to replace it.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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