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Unread 11-16-2013, 09:35 PM   #1
Springer45
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Driveshaft experiment/ sye purchase.

I'm having some issues and I'm not sure if it's a sye issue or a rear end issue. When I did my lift I bought used axles with 4.11 gears. The guy that sold the axles parts out old yjs and was not the original owner of the jeep, so when he said that the rear end had recently been rebuilt I didn't exactly trust him. After I did my 4" lift and replaced the axles and wheels I started hearing a noise. I thought it was the used 33" tires I put on it but a month later I replaced them with some new ones. That wasn't it. Then my auto tranny went out. I had it rebuilt. That wasn't it either. I am eliminating the tcase as the problem as it didn't make noise before. So I think it's either the driveshaft angle (the transmission drop isn't enough enough especially with an auto transmission) or it's the rear end. So I was thinking of doing an experiment, remove the rear driveshaft kick it into 4wd high and drive it at freeway speeds to see if it still makes that noise. My question is would the rear end still make all the normal noises it would with the shaft hooked up? Or is there something with the differential that would be bypassed by not having the shaft hooked up? Is this a good test or would i possibly ruin something? I'm planning on puttin a sye kit and double Cardon shaft in eventually anyways but I've averaged about $1000 a month into this new jeep since I bought it 6mo ago so I don't really want to spend more money on it right now if I don't have to.

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Unread 11-16-2013, 09:46 PM   #2
linusb
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What kind of noise are you hearing? Did you shim the pinion angle with the lift and TC drop? Any vibrations when driving?
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1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
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Unread 11-16-2013, 10:15 PM   #3
Springer45
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Yes the rc lift kit comes with them built onto the rear springs. Honestly the noise has always sounded to me like a really hard vibration. It seems to go away when I get someone else in there or at least it's not as prominent. Which makes me believe that it's a driveshaft angle ( the extra weight changes the angle just enough). But I can't confirm that 100%. It also mostly makes a noise at higher speeds and seems to make everything vibrate really hard. It vibrates then stops then vibrates again with only a second or so in between. I believe that the shims and the transmission drop would probably suffice (not ideal but it works) if it was on a manual trans jeep but being that it's an auto and a bit longer I believe it might be the issue. Do you think taking the driveshaft out would be an ok way to test my jeep? Also the rear end doesn't leak and when I changed the oil it was free of metal shavings. Has anyone else had this issue with an auto trans and a 4" lift kit? I've never not done a sye but I honestly am about out of money for this project and it's my dd.
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Unread 11-17-2013, 06:51 AM   #4
linusb
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Sounds 99 percent like an angle issue. I think it's safe to take off rear ds and run in front wheel drive. If its an angle issue the vibes will go away.
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1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
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Unread 11-17-2013, 07:04 AM   #5
TSEJEEPERS
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I know it goes without saying but, since you do not have a SYE you are going to have to seal the end of the transfercase up before driving it.
Does the vibration go away when you let off the gas?
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Unread 11-17-2013, 08:58 AM   #6
Springer45
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Yes it does but only because I slow down. I'm trying to think of how I can seal the transfer case. I didn't think about the fact that it would leak.... Crap.
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Unread 11-17-2013, 09:34 AM   #7
jeepster93
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Unread 11-17-2013, 11:31 AM   #8
Springer45
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That appears to be a dangerous proposition. Half the tcase fluid is in the bottle.

Linusb, I remember when my rear end went out on my ford that it was leaking like crazy and had a tend any to lock up when I came to a near stop. It seems as though, after experiencing a rear end going bad, a rear end has a tendency to show signs of wear at slower speeds. And from what I've researched it seems like driveshafts vibrate at all speeds but it becomes most noticeable at higher speeds? What makes you so sure that it's a driveshaft thing? What's the difference in signs of issues between the two?
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Unread 11-17-2013, 02:27 PM   #9
hotcobra03
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Can you post picks of shaft front and back
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Unread 11-17-2013, 03:38 PM   #10
Springer45
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I don't think I can do that on this site ... Ya I can.
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Unread 11-17-2013, 04:24 PM   #11
Springer45
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Unread 11-17-2013, 04:27 PM   #12
Springer45
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I guess maybe I can't? Can you see those photos?
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Unread 11-17-2013, 04:33 PM   #13
Springer45
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Rear driveshaft hopefully this one works
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Unread 11-17-2013, 04:37 PM   #14
Springer45
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Better?
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Unread 11-17-2013, 04:38 PM   #15
Springer45
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