Oil Dripping Off of Rear Drive Shaft - Ford Powerstroke Diesel Forum
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Old 11-11-2011, 06:11 AM
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Oil Dripping Off of Rear Drive Shaft

I have a small oil leak dripping off of my rear drive shaft right behind the transfer case. It is a slow leak that only leaves a small spot on my garage floor every night. I replaced the seal between the transfer case and the drive shaft and it did not fix the problem. I have oil on the muffler and all under the truck where that seal is from where it throws oil while the drive shaft is spinning. Any suggestions to where else the leak could be coming from? How often are these seals bad from the parts store? I purchased the seal at NAPA and it was installed by a mechanic here at the Ford dealership I work at. Any suggestions would be greatly appreciated. I am about to have in put in a red head gearbox for me and figured I might as well have him take a peek at this for me as well.
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Old 11-18-2011, 12:13 PM
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what color is this oil?

Red= ATF (used in transmission and transfer case)
Black = Engine Oil
Brown AND smelling bad = Gear oil

And grease would be obvious
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Old 01-06-2012, 07:57 AM
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It appears to be engine oil. I did notice some ATF fluid the other day too. I am looking into replacing the ujoint and yoke. I think it may cost just a little more for a new or reman driveshaft though. Any suggestions on where to find one?
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Old 01-06-2012, 08:28 AM
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Unless you have a CCV exiting there, I can't fathom how engine oil could be the culprit since there is nothing but ATF inside everything all around that area. I would redouble my efforts on scrutinizing the transfer case seal that was just replaced. It's very possible the seal was damaged during installation?

Was the driveshaft yoke damaged?
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Old 01-06-2012, 08:47 AM
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That is what I am leaning towards right now. We have an awesome drivestrain company here in Dayton so I am going to send the driveshaft to them and have a new one built. They a little over half the cost of the yoke and ujoint for a whole driveshaft. I am going to replace that seal again as well. Thanks for the input.
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