diff grabbing on turns - Ford Powerstroke Diesel Forum
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Old 11-07-2011, 04:48 PM
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Question diff grabbing on turns

A while back (august) I did a diff fluid change because the previous person didn't seal it correctly and it was leaking. I used royal purple and I thought I wouldn't need any friction modifier because I was using royal purple. Well this weekend the truck was loaded down with corn and it seemed like the rear wheels were grabbing on turns. When I finished driving I noticed that my rear-pinion seal was leaking . So any ideas on what could have made that leak? Should I get the seal replaced and just add friction modifier or should I get the dif inspected (It looked good when I changed the fluid but I'm no professional)? Could it be the clutch pack in the diff?
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Old 11-08-2011, 06:14 AM
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Depends on how bad it's grabbing, the clutches are "chattering" but that means your LS is actually working!

I hear mine in tight turns, on dry pavement, sometimes and feel like that's the was it's Supposed to be! Probably more when loaded...

So, if it's doing it all the time, even on wider turns, yes I would add some modifier. BUT not too much or you'll lose your LS! Maybe just an .oz or two.
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Old 11-08-2011, 06:26 AM
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I felt every turn when loaded...and to me it just didn't feel right but like I said I'm no professional. Unloaded however I barely feel it at all. Any ideas on whey the pinion seal would be leaking?
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Old 11-08-2011, 06:35 AM
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If you hear it on every turn, I'd add a bit of modifier.

Make sure the vent hose for the diff housing isn't plugged. Other than that, the pinon seals aren't the greatest mine leaks a little. No biggie it never really required fluid, just a little wet back there. Keep an eye on it maybe....
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Old 11-10-2011, 08:07 PM
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Check the vent tube for blockage. Chances are the diff heated up a bit more since the truck was working, and the pressure had nowhere to go, so it pushed out the pinion seal. I was ready to change out my pinion seal, and for some reason I thought to check the tube, which had crap in it.
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