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The first thing I would do is remove the drive shaft and check the torque specs of the pinion nut. Pinion seal leaks can be indicative of a loose pinion nut which then allows movement of the upper bearing and excess wear and leakage at the seal. IIRC the torque should be in the neighborhood of 160 ft/lbs and the nut should be staked properly.
If all looks good, then remove the nut and pull the pinion flange. Check for a groove where the seal rides. If there is a significant groove, the pinion flange will either need to be replaced, or a speedi sleeve placed over the groove. You can now pull the pinion seal and tap in a new one. Check the washer underneath the seal for grooves and wear. This washer can spin around the upper bearing if the pinion nut was loose. Once the new seal is in place, put the pinion flange back on and tighten and stake a new nut.
There... You're done.
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