The Mud Pit > Wrenching

Replacing rear pinion seal...

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submrnman:
The rear pinion seal in me rear diff has just developed a slow leak... The new pinion seal and diff gasket just came in the mail the other day.n I have never done a pinion seal replacement, I know the basics of it though.  Has anyone ever replaced a pinion seal?  If so, any guidance you can offer would be much appreciated....

BlacXJeep:
I'm not an expert by any means, but it would be helpful to know what real axle you are running.

submrnman:
Oh sorry.  I'm running a Dana 35 in the rear.

skibum:
Changing a pinion seal is very easy. There is just one very important thing to know first before anything is disasembled. It is very important to put a referance mark on the pinion nut & shaft so when retighening the marks they are lined up to make sure the crush collar is not over tighened & not change the pinoin bearing preload. Hope this helps you out.

Bill3753:
Another this you want to do is make sure you replace the nut with a new one.  They use a thread deforming lock nut on the pinion.  Basically, they are only good to be torqued once.  You can use them again, but you'll risk it backing off.  That will change your bearing preload and cause big problems in the rear.

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