By "axle seal" I'm to assume it's the output shaft seal.
If you are talking about that - that is really easy to remove....(you need a seal puller), and replace (you need a seal installer, or barring that, take a 3/4" shackle and use that as a seal installer). I've done a few with the shackle as the seal installer.
For the pinion - you'll need a seal puller, and you need at least something to help keep the seal in place as you drive it in. I've only done one of those - with the diff out when I did my Detroit build up.
-Steve
It is really easy for the pinion
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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