[mongocanfly]

I know alot of people that have gotten away with leaving the old crush sleeve and just changing the yoke and pinion seals..I'm pretty sure you know how the crush sleeve works when building a diff, but it sets the preload on the pinion bearings, that's checked with a in/lb dial torque wrench as you go..with the diff out of the housing
And it takes alot of torque on the pinion nut to crush it..
If just changing the seal,some people will mark the old nut and yoke and put it back in the same spot..but since youd be changing that it wont help..
If your going to do all that, I would go ahead and check the pattern before you start..take some pics of the pattern...the pull the chunk and pinion, replace the crush sleeve and torque the pinion nut to crush it.
Or even better, swap it out to the crush sleeve eliminator kit..