Rear pinion seal leak - Ford Powerstroke Diesel Forum
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Old 12-09-2012, 12:44 AM
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Rear pinion seal leak

Ok so I have a rear pinion sea leak...question is, where do i buy the seal/gasket from, is it generic? Any links would be great. Also what weight oil to i refill the diff with? Thanks!
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Old 12-09-2012, 01:42 AM
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Not sure about the gasket but the weight 75w-140
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Old 12-09-2012, 10:44 AM
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Yep, mine is leaking too. I hear the part is pretty cheap but the labor can run anywhere from $75-250 depending on what needs to be done.

75W-140 if you're a single axle and make sure it's synthetic (that may start a flamewar) with the LSD additive.
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Old 12-09-2012, 06:59 PM
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Ok thanks for the oil question. Now where do I get that gasket from? Or atleast what part # am I looking to buy if I get it online.
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Old 12-10-2012, 06:50 PM
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....bump....
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Old 12-11-2012, 05:43 AM
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Is this what you're looking for?

2010 Ford F-250 Differential Pinion Seal | FordParts.com Super Duty

Why not just go to your dealer and get one?
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Old 12-11-2012, 05:52 AM
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75 140 is correct but it has to be synthetic

the diff cover seal is just RTV if u decide to pull it and change all the fluid .. you may also need some limited slip additive


the pinion seal isn't just a easy replacement there is a crush sleeve and torque specs that go with the pinion nut so if you don't do it correctly you can wipe out bearings

if a DIY guy does it , they typically mark the nut and shaft then count how many turns to remove ,, reassemble to the exact location after the new seal is in
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Old 12-11-2012, 04:48 PM
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Quote:
Originally Posted by Doss View Post
Yep, mine is leaking too. I hear the part is pretty cheap but the labor can run anywhere from $75-250 depending on what needs to be done.

75W-140 if you're a single axle and make sure it's synthetic (that may start a flamewar) with the LSD additive.
It's simple if you have an impact wrench other wise busting it loose and setting the tq back when you are done might be a problem. Take rear drive shaft off, remove pinion nut, remove yoke, remove old seal, use premtex blue, put seal back on, put yoke on, pinion nut (may need to use a new one depending on type), and put blue thread locker on the nut. done.
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Old 12-11-2012, 05:02 PM
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if you have an old school inch pound torque wrench with the beam, measure the torque it takes to turn the pinion, drive shaft off, wheels off the ground, BEFORE you take off the pinion nut, the tighten it back down when finished so it takes that much torque to move again and it will be just right. also if you get an aftermarket seal make sure if it has the oil return ridges between the lips of the seal that they are angled in the right direction.



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Old 12-21-2012, 09:02 AM
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Quote:
Originally Posted by Code3F250 View Post
Ok so I have a rear pinion sea leak...question is, where do i buy the seal/gasket from, is it generic? Any links would be great. Also what weight oil to i refill the diff with? Thanks!
I had the local Ford garage repair this recently for about $350, which includes a 10,000 miles post install...
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