Just did my front pinion seal last weekend. You will need an impact wrench. The nut was on there pretty good. Took three cycles of the air compressor to finally get it off. If you have the jeep on a lift you might be able to get enough leverage on a breaker bar. I could not get enough leverage with the jeep on the ground.
I did not need a gear puller. I hit it a few times with a rubber mallet with little success. I then took out my riveting gun (same as hitting it with a hammer only more controlled) and tapped it right off in about 5 seconds.
The hardest part was getting the old seal out. I had to bend the flange up almost all the way around before it broke free. Once it broke free it popped right out.
Just did my front seal. It's super easy to do. the hardest part is getting the old seal out. I got mine out with a cheapo harbor freight seal puller, a screwdriver and a hammer. You just have to work it for a little bit for it to pop out.
As far as an impact, it sure makes it a lot easier to just zip it off, but it can be done without it. I had trouble torquing the nut because my torque wrench was a tad long and hitting the ground but i eventually got it to spec. Make sure you get a new pinion nut too!
While the pinion nut is indeed tight, it's not so tight that you can't remove it without an impact wrench. A breaker-bar will work. Chock the tires since removing/tightening the pinion nuts will try to rotate the axle shafts. Shifting into 4Hi first and keeping the transmission in gear or Park can help keep the Jeep from rolling as you work on the pinion nut. Retighten the pinion nuts to 160-180 ft-lbs. after applying Locktite to the threads.
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I did my front a few weeks ago ...
I took a 24" pipe wrench on the yolk(wedged against the floor) and used a 2' piece of pipe on the ratchet for leverage.
I used a foam brush and made a paint mark on the nut and just tightened it back up till it lined up
not regular maintenance but not uncommon. take the diff breather hose and blow it out with compressed air to be sure its free of debris. often that gets filled with mud and causes the seals to start leaking.