The crush sleeve is part of his pinion shaft that the depth is already set and installed.
He will swap over his ring gear to the new Sure-grip casting, probably put new carrier bearings on it, and then install and set the ring gear to pinion backlash and also check his wear pattern with the yellow grease to final ok everything is set right not running off to one end of the tooth or the other.
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Now if he was putting in a new ring and pinion Gear Set, then by all means have to redo the crush sleeve, or the crush sleeve eliminator.
