You HAVE to take the pinion nut off (good luck) to get to the seal. You can't see it with the driveshaft still on the truck. It took me an hour and some time with the torch and impact wrench to get my pinion nut off. Just pop it out and pop in the new one. Like everyone says, mark the threads and the nut. Rear ends are $$ to have rebuilt, and since you need your truck everyday, I would take the extra time to be sure it's done right the first time.
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