Stain from Drive Shaft into Dif. - Ford Powerstroke Diesel Forum
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Old 04-21-2010, 07:01 PM
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Stain from Drive Shaft into Dif.

Like the title says,

I noticed today that there is a stain looking like something is leaking from where the drive shaft connects to the differential. Is this normal or something I should have looked at?
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Old 04-22-2010, 02:47 AM
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Could be a pinion seal leaking. Check your diff fluid to make sure you're not low.
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Old 04-22-2010, 03:19 AM
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If the rear diff vent line is plugged it's not uncommon for the fluid to be pushed out of the pinion seal from becoming overpressurized. Check to make sure it isn't plugged and that you still have enough fluid.
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Old 04-22-2010, 05:38 AM
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How do I go about checking to see of the line is plugged? What type of diff fluid should I get if it is low?
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Old 04-22-2010, 05:50 AM
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I got my drive shaft wrapped in barbed wire a few weeks back. I had to replace the rear pinion seal because it was leaking like you are describing.
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Old 04-26-2010, 06:33 PM
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Quote:
Originally Posted by brendanlush View Post
How do I go about checking to see of the line is plugged? What type of diff fluid should I get if it is low?
Find the vent line coming off your axle, not too sure where it is but it'll be on the top, either on the axle tubes or the differential itself. Chase the vent line to where it's hanging off the frame and inspect it for blockage. You may need to remove and blow through it to make sure. Check your OM for fluid recommendation. I'd definitely check your fluid level before going anywhere though, a dry diff is not a happy diff.
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