usually there is a sleeve over the pinion shaft that crushes between the upper and lower bearings to help keep the pinion from moving in and out. I know with the GM 10 and 12 bolts once you crush that sleeve, a lot of times you had to change it out before you could get the proper torque back on the nut. If that's the case, it's not that big a deal, just a lot of work to pull the carrier, then the pinion.
For sure try and crank the nut down and tighten it up. If you can get rid of the slop that way you should be golden!
If yer gonna fight, fight like the third monkey on the ramp to Noah's Ark.
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