Pinion nut, how tight?
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You tighten it (using an old crush collar) to the same spot or 1/16th tighter OR (using a new crush collar) to the correct SPINNING drag on the pinion bearings....20-25 inch/pounds IIRC using a beam style torque wrench. I've never re-used a crush collar and you really aren't supposed to but some will say it is acceptable.