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Old 02-04-2014, 08:30 PM   #1
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Driveshaft doesnt look right...

I have no clue what's caused this. It appears to be coming solely from the first U joint. The seal at the back of the TC is dry.
Also there's fluid on that (speed sensor?) black electronic piece.
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Old 02-04-2014, 08:45 PM   #2
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Mine looks nothing like that. You check your t case fluid? Looks like the rear bearing is leaking when in motion and throwing it up there. It spreads out on dirt though. May look worse than it is. I would check the fluid for sure.

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Old 02-04-2014, 08:57 PM   #3
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"Rear bearing" at the back of the SYE? That shaft and surrounding area on the SYE is dry. It is just that part of the joint.
Is that a U joint? Looks like 3 pieces...
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Old 02-04-2014, 09:00 PM   #4
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Well if your referring to the same color caused by your speed sensor how did the u joint chuck it there? I think it's t case fluid that travels to the u joint before flinging off. If you think that's grease out of the old u joint more power to ya.

Edit. Yes that is a couple u joints there. They are the X shaped things. There are 2 there and one by your axle as you have an SYE and double Cardin shaft.

Edit I was talking about the SYE bearing leaking.
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Old 02-04-2014, 09:15 PM   #5
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The speed sensor is unrelated to the shaft. I know it's not grease, grease isn't that thin and mine is red.
The SYE is dry
Unless the shaft coming out of it is hollow, I don't see how the fluid can be making it to the U joint there.
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Old 02-04-2014, 09:19 PM   #6
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There are two o-rings that seal the speedometer gear sensor housing into the transfer case, perhaps one of those got nicked or damaged when reinstalling it after the SYE installation.

The CV has three items in it that contain grease... 2 u-joints and the centering joint. It could be that they were recently greased & excess grease has been slung around, or one of those three items has blown its seal & is leaking grease.

Clean the entire CV off of all that grease/oil/etc. with brake cleaner & look at it again in a day or two to maybe see where the grease, if it is grease that is leaking out, is coming from.
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Old 02-04-2014, 09:20 PM   #7
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The u joint is black from one end to the other. Why favor the unjointed side over the transfer case? The t case has the juicy stuff the u joint don't. Edit. Grease don't turn axles that color. Diff leaks or t case leaks. Grease is not fluid enough for that liquid leak your seeing. Are there aftermarket greaseable fittings on your u joints anyway? Also no one would grease the speedo sensor. ( that is it. Correctomundo)
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Old 02-04-2014, 09:27 PM   #8
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Edit. Grease don't turn axles that color. Diff leaks or t case leaks. Grease is not fluid enough for that liquid leak your seeing. Are there aftermarket greaseable fittings on your u joints anyway? Also no one would grease the speedo sensor. ( that is it. Correctomundo)
Grease can and definitely does bleed oil.

http://www.mobiloil.com/USA-English/...rease_Gun.aspx
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Old 02-04-2014, 09:31 PM   #9
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I Agee all the time with you on stuff when corrected Jerry. Here I feel it's misleading. Don't see grease as being feasible. Tons of respect brother. If you can explain it and educate me I'm all for it. Otherwise I say that's defiantly t case fluid.

Edit. That link is bunk lol. Nothing in it relates.
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Old 02-04-2014, 09:32 PM   #10
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I will spray the cleaner tomorrow and also check for grease fittings. I THINK there are fittings on one of the U joints...
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Old 02-04-2014, 09:33 PM   #11
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I Agee all the time with you on stuff when corrected Jerry. Here I feel it's misleading. Don't see grease as being feasible. Tons of respect brother. If you can explain it and educate me I'm all for it. Otherwise I say that's defiantly t case fluid.
It definitely can be ATF from the tcase which is why I mentioned the possibility of nicked o-rings that seal the speedometer gear housing to the tcase. But I have seen grease from CVs & u-joints create a dark oily mess too so it needed to be mentioned.
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Old 02-04-2014, 09:39 PM   #12
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I believe I know the difference between grease and oil. The grease we use is red and goes pure black if it gets dirty. And it wasn't sticky.
The stuff was yellowish and felt like oil.

Those U joints don't have grease fittings on them, they are sealed. Could one of those seals have busted and water gotten in and then just mixed up with the grease, and that's what's happening?
This happened in the last 3,000 miles. It wasn't there last oil change.
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Old 02-04-2014, 09:44 PM   #13
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It definitely can be ATF from the tcase which is why I mentioned the possibility of nicked o-rings that seal the speedometer gear housing to the tcase. But I have seen grease from CVs & u-joints create a dark oily mess too so it bears mentioning.
Once again mad respect. Both of us trying to help someone. 2 heads are better than one. I have learned so much from you I don't like getting confrontational. I admit when wrong too. You can probably vouch lol. Anyway. Hope he figures it out and I'm sure we both helped.
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Old 02-04-2014, 09:46 PM   #14
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[QUOTE="acf5;7995105"]I believe I know the difference between grease and oil. /QUOTE.]

I think it's your t case bro. And as bad as that looks it probably isn't even low. That stuff spreads sticks and preserves. It looks worse than it is. Check the fluid for safety though.
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Old 02-04-2014, 10:02 PM   #15
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I try to keep my junk clean after each trip, and grease my shaft at least twice a year.
It definitely flings what looks like oil, but started as red grease.
To me, the OP's pics look like there is a small leak around the speed sensor, coupled with the driveline's grease splatter. Hard to tell. It's so dirty.


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Old 02-04-2014, 10:10 PM   #16
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I know it's dirty
I do wash it after trips all around and over, under, in, out so on.
We got snow Sunday, and we are getting more tonight. The roads have been wet and the lot at my school for students is dirt, so that's where the uncleanliness comes from.

I hate looking at the salt on mine, but what can I do...it'll be over in a month or two.
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Old 02-04-2014, 10:13 PM   #17
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Also rusty...it was under coated but wasn't an amazing job. Tailgate was also replaced and put in at an angle. (Fixed...)
The undercoat lasted a few weeks before it was showing rust again. My dad and I will do it ourselves (thinking about starting thread about KBS coatings) come spring.
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Old 02-04-2014, 10:34 PM   #18
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Lol. No worries. Jeeps are supposed to be dirty. I was trying to illustrate the driveline spray that happens after I wash and grease the Jeep. Sorry if it came across the wrong way.
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Old 02-04-2014, 10:47 PM   #19
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I try to keep my junk clean after each trip, and grease my shaft at least twice a year. It definitely flings what looks like oil, but started as red grease. To me, the OP's pics look like there is a small leak around the speed sensor, coupled with the driveline's grease splatter. Hard to tell. It's so dirty.

The path to your tcase is oil free the shaft and the fact you have greaseable joints helps a lot. Look at the color of the yoke on his compared
to yours. You can see the grease don't go that way. His flung stuff just didn't come from a zerk that don't exist.
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Old 02-04-2014, 10:47 PM   #20
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Well I don't have grease fittings, they are sealed there.
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Old 02-04-2014, 10:48 PM   #21
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It's looks like the oil is finding its way past the nut on the yoke. Some of our trucks at work do that. I've had some luck with the blue loc tite keeping them from doing that.
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Old 02-04-2014, 11:08 PM   #22
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That yoke and nut could be gone entirely & it won't leak on a TJ. Only older YJ Wranglers will leak from something like that.
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Old 02-04-2014, 11:19 PM   #23
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Pic 1 9' o'clock. Look close you see that oil going up to the bearing. And that's on my I phone. Not a monster monitor. Below there it is dry. This would make since on an electrical issue but wow lol.
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Old 02-05-2014, 01:01 PM   #24
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It's looks like the oil is finding its way past the nut on the yoke. Some of our trucks at work do that. I've had some luck with the blue loc tite keeping them from doing that.
I agree. To repair; remove drive shaft, remove nut securing yoke, remove washer ,there might be a rubber washer behind the steel washer if there is discard it and spray area with brake clean. Fill cavity with RTV and reinstall washer, nut and drive shaft.
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Old 02-05-2014, 01:11 PM   #25
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Again, the TJ's transfer case output shaft has a seal on it. With that seal intact, it won't leak even with the yoke & nut being entirely off. YJs can have that issue but not the TJ.
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Old 02-05-2014, 08:55 PM   #26
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That yoke and nut could be gone entirely & it won't leak on a TJ. Only older YJ Wranglers will leak from something like that.
Guess I didn't look close enough at the pic. Thought that was on the rear axle side.
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Old 02-05-2014, 09:06 PM   #27
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Ok but that's true on the rear axle's pinion shaft too. Neither depends on the presence of the yoke to seal it.
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Old 02-05-2014, 10:03 PM   #28
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I have the same set up and it was ATF coming from the transfer case on mine. The fluid was leaking past the shaft splines and past the rubber washer. I pulled the yoke off the transfer case and got a new washer and smeared the inside of the splines with rtv and it hasn't leaked since
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Old 02-05-2014, 11:42 PM   #29
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Ok but that's true on the rear axle's pinion shaft too. Neither depends on the presence of the yoke to seal it.
The yoke IS the inner sealing surface. The pinion seal, seals on the yoke. Same with the transfer case output with a SYE installed.


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