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I have heard about these nitro gears being pretty good. However I'm with ben-e-boy stick with genuine and you will have less issues you may save 180 now but it may end up costing you a lot more along the track. If you have your diffs apart i would certainly be rebuilding them the parts are cheap and its an easy enough job. The seals on your knuckles are designed to keep stuff out not in hence they will leak oil if your axle seal is gone. They dont normally have to keep anything in as this area is sealed from the diff oil. Again with ben-e-boy inspect your cv's while your at it make sure they are moving well and dont have excess play in them. Hope this helps.