When I put mine in I reused the oil seals since I only had like 26k on my diff. But one thing you are missing witch is a big safely/ reliability issue is the ring gear bolts. once they are torqued then removed they are now no longer as strong as they once are. so I recommend ordering those too for like $50. That should be in the sticky also. My install was done at a Nissan dealership for around $850 ish.
Also I have not had any issues with oil leaking.
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