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Go Back   Ford Powerstroke Diesel Forum > Ford Powerstroke 99-03 7.3L Forums > 99-03 7.3L Powerstroke Problems > 99-03 7.3 Drivetrain Problems
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Old 11-04-2009, 07:56 AM
scpbmxer01 scpbmxer01 is offline
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rear end spitting fluid

I notice that my rear end is leaking fluid where it joins with the drive shaft is there a seal or something in there that could have gone bad? it is just leaking a little bit i can see where it splatters up under the bed its leaving just a little fluid pn the shocks and such. any help would be great.
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Old 11-04-2009, 07:58 AM
superxcrewfx4 superxcrewfx4 is offline
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Pinion seal or something.... Thats the name....
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Old 11-04-2009, 07:59 AM
Black&Gold Black&Gold is offline
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yes there is a seal there, if it is leaking bad enough to spin up in the bottom of the bed and get on the shocks it needs to be replaced.
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Old 11-04-2009, 08:09 AM
scpbmxer01 scpbmxer01 is offline
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i am going to do it before I drive it again how complicating is this replacement?
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Old 11-04-2009, 11:43 AM
scpbmxer01 scpbmxer01 is offline
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The diff was also fairly warm could there be a bad berring or something as well?
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Old 11-04-2009, 11:45 AM
Goose350 Goose350 is offline
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Pinion seal
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Old 11-04-2009, 12:00 PM
Wide Right Wide Right is offline
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Leaking pinion seals are very common on these trucks. I noticed mine was leaking recently. I did a bunch of searching on this site and came to the conclusion that replacing the pinion seal was a job better left to the pros. You've got to get the pre-load just right. Too tight and you'll ruin the bearings. Too loose and the pinion gear will move forward and back. A good mechanic should be able to knock this out in 45 minutes or less. It shouldn't run more than $150.

If you decide to do it yourself, you'll need a new pinion seal and a new crush sleeve. I think Ford also recommends using a new pinion nut. You'll also need an inch-pound beam torque wrench to set the pre-load. BTW, if you set the pre-load too tight, you have to start over again with a new crush sleeve.

The diff should be warm if you've been driving the truck. There is a bearing in there (a couple of them, actually). Once you have the pinion seal out, I think you can get to the front bearing and inspect it. Good luck with it.
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