3.0L RWD

I changed out the rear diff gasket and changed the fluid and its now leaking from the pinion seal. I plan on fixing it sometime next week. I would appreciate a list of tools and parts i'll need :) advise is great too.

Initially I wanted a shop to do it, but if it's completely do-able I'll save the money and do it myself

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There's two ways to do this. One includes installing a new crush sleeve, setting the bearing pre-load, and making sure it's done right.

The other, backyard mechanic way, is to just put in a new seal and leave the old crush sleeve as is and make sure you put everything back where you found it. When you re-install that pinion yoke, you want to make sure you put it right back where it was. The best way to do this is to mark the pinion shaft, the yoke, and the nut holding it all together so you know where it was. This is important because the pinion bearings and crush sleeve were torqued from the factory, and if you don't put the yoke and it's nut right back where it was, your bearings may come loose and trash your gear set. Use Loctite on the pinion nut so that it doesn't work itself loose. Also, don't tighten the pinion nut past where you marked it, or else you'll mess with the bearing preload and crush sleeve and have to resort to doing it the right way, because you trashed your gear set.

Doing it the backyard mechanic way is doing so at your own risk.