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Old 01-01-2013, 09:24 PM   #1
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drive shaft vibrations

Hi i am new here and i need some advice. I have a 2004 TJ with a 6" suspension lift and 3" body lift. I bought it used like this, i personally have done nothing to the vehicle. I blew out my rear u-joint which broke my drive shaft and my transfer case. The u-joint had been going bad since i bought it and i drove it about 5k miles before it finally failed, so i it is completely my fault, i just didnt realize what the problem was.

Anyway not trying to drag out this story but i just got a used transfer case and drive shaft to replace what had been broken. Turns out the previous owner had a custom transfer case and drive shaft and the mechanic that i had repair my Jeep could not find these specific parts, so he put in a stock transfer case and drive shaft.

Now i am scared to drive the thing cus i still have drive shaft vibes, but not nearly as bad as before. It really only occurs less than 25 mph, whereas my old drive shaft vibrated even as high as 55 mph, but i cant afford to destroy another drive shaft and transfer case. The old drive shaft had a double u-joint on the transfer case side of the drive shaft but this one does not. I am a bit confused cus the u-joints were causing my old drive shaft to vibrate, but i should have new u-joints now so i don't know what is causing the vibrations now. Do you think i just need to get the drive shaft balanced?

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Old 01-01-2013, 09:32 PM   #2
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Old 01-02-2013, 11:56 AM   #3
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is the t-case dropped with a spacer?
do you have a slip yoke?
pics?
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Old 01-02-2013, 12:02 PM   #4
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Old 01-02-2013, 08:08 PM   #5
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Quote:
Originally Posted by stumpbuster View Post
is the t-case dropped with a spacer?
do you have a slip yoke?
pics?
I'm pretty sure the t-case is not dropped but i am not sure about the slip yoke. I'd post a pic but its too dark now. This one is very similar to what i have tho:



I'm going to get the drive shaft balanced tomorrow and they might be able to help me but i'd still appreciate any suggestions.
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Old 01-03-2013, 10:26 AM   #6
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need YOUR pic, or a few
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Old 01-03-2013, 10:53 AM   #7
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Quote:
Originally Posted by turnbull View Post
a 6" suspension lift and 3" body lift.
I'm a jeep newbie, but I believe this could be an issue........
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Old 01-03-2013, 11:26 AM   #8
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Hence my pop corn guy lol. I don't see how in the world you could run a stock drive shaft on a 6" suspension lift
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Old 01-03-2013, 02:13 PM   #9
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Quote:
Originally Posted by turnbull View Post
Hi i am new here and i need some advice. I have a 2004 TJ with a 6" suspension lift and 3" body lift. I bought it used like this, i personally have done nothing to the vehicle. I blew out my rear u-joint which broke my drive shaft and my transfer case. The u-joint had been going bad since i bought it and i drove it about 5k miles before it finally failed, so i it is completely my fault, i just didnt realize what the problem was.

Anyway not trying to drag out this story but i just got a used transfer case and drive shaft to replace what had been broken. Turns out the previous owner had a custom transfer case and drive shaft and the mechanic that i had repair my Jeep could not find these specific parts, so he put in a stock transfer case and drive shaft.

Now i am scared to drive the thing cus i still have drive shaft vibes, but not nearly as bad as before. It really only occurs less than 25 mph, whereas my old drive shaft vibrated even as high as 55 mph, but i cant afford to destroy another drive shaft and transfer case. The old drive shaft had a double u-joint on the transfer case side of the drive shaft but this one does not. I am a bit confused cus the u-joints were causing my old drive shaft to vibrate, but i should have new u-joints now so i don't know what is causing the vibrations now. Do you think i just need to get the drive shaft balanced?
This is part of your issues. Now it sounds like you replaced a TC with a SYE and a DC shaft for a stock TC with a slip yoke type driveshaft which was a BIG step backwards. The reason you have different vibes now is that your pinion angle is all wrong for the type of shaft you are currently running. The vibes before were from bad ujoints, now its from bad angles...... And your mechanic hosed you as a simple internet search would have found him all the parts needed to repair the old TC.
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Old 01-03-2013, 02:31 PM   #10
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Yeah, if you still have the old TC, you need to get the SYE/CV off of it and get it into your new TC to eliminate the slip yoke.
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Old 01-03-2013, 03:49 PM   #11
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Yep.....get your old TC and re install it then call Tom Woods and have him talk you through what size shaft you need....your gonna have a lot bigger problems with that set up

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