Re: rear wheel bearing replacment?? help
you're talking about the pinion seal then. There are two approaches people take without rebuilding the diff, both obviously requires you to pull the rear driveshaft.
A. You can mark the nut and pinion so you can see how far the nut was on and the position of the nut. Pull the pinion, replace the seal, put the old nut back on but about 1/10th of an inch past the line you made.
You can also count how many turns it takes for the nut to leave the original position, then put it back on the same + 1/10th of an inch past the line you made.
B. If you have access to a torq wrench that reads around 300lbs. (the pinion nut can be anywhere between 150-250lbs) Adjust the torq wrench increasing the lbs and trying to remove the nut. Once you found how many lbs. it took to break the nut loose, increase the wrench by 5 lbs, pull the pinion, replace seal, reinstall the nut.