caged

there are 2 pinion seals listed for the xj d30. buy both to be sure you have the correct one, then just return the other later.

start by removing the front drive shaft. there are four 8mm bolts holding the straps on. be careful not to strip these. make a note which side and direction each strap goes for install.

then mark the pinion nut and yoke. also note/mark the drive shaft in relation to the yoke for install.
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then remove the pinion nut. i used an 1 1/4 socket.
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then remove the nut. i used an electric impact.
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then remove the washer, making sure to note which side is out.
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then pull off the yoke. she's pretty dirty.
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then using a seal puller, or screwdriver, remove the old seal.
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at this point, you can pull and inspect the outer bearing. we passed.
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clean it all up with some brake cleaner.
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coat the new seal lip with some oil.
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using a plastic mallet, tap the new seal in place. be sure to tap evenly around the lip. a bfh will just damage the lip, and a rubber mallet will be too soft. you can use wood and a bfh if that's all you have.
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reinstall the yoke in the same relation to removal.
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install washer in same relation as removal.
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then the nut. you should use a new nut, but then marking for torque would be unnecessary, now wouldn't it?
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torque to about 200 lb/ft. i didn't like the feel the torque wrench had against the ring/pinion, so i just used the impact. but xj doesn't use a crush sleeve, so just get it real tight. try to get as close to 200 as you can.
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there you go. now bolt up the drive shaft and enjoy.
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i also did a fluid change while we were at it.