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Old 09-30-2008, 01:37 PM   #1
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Thumbs down vibration

i got a wierd vibration when i am goin down the road. it doesn't do it on acceleration so i dont think its a u-joint, it pretty much only does it around 2nd, 3rd, or maybe sometimes 4th when i let off the gas and am slowing down, maybe a balance issue?

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Old 09-30-2008, 01:55 PM   #2
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What height suspension lift do you have? What have you done to reduce the angles at the u-joints... like have you done a transfer case drop? SYE and CV driveshaft? Has anyone adjusted the front or rear pinion angles? Do you know what your front caster angle is?

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Old 09-30-2008, 04:11 PM   #3
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4" suspension lift, transfer case drop, sye joint. i dont have a clue about the pinion angles or even wat they are, u talkin about in the diff.? and caster angle? i dont know what that is either sorry
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Old 09-30-2008, 05:08 PM   #4
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It doesn't sound like you personally installed your SYE kit, so it's possible that who did install it may not have set the rear axle's pinion angle properly. An improper pinion angle will cause drivetrain (u-joint) vibrations.

The pinion is that shaft that comes out of the front of the rear axle and connects to the driveshaft. If that pinion shaft's angle does not match the CV driveshaft's angle (see below) that was installed at the time of the SYE kit, it will cause vibes. Is there a chance you can post a photo of where the rear driveshaft connects to the rear axle's pinion shaft, taken from the side so we can see the angle? A second photo showing the front of your rear driveshaft would be useful too, to confirm what kind of a driveshaft is actually installed, to confirm it's an aftermarket CV (constant velocity) driveshaft.

If your rear driveshaft is indeed a CV driveshaft as indicated by a single u-joint in the rear and two u-joints in the front, you angles should look like this...


Finally, you should not still have a transfer case drop if you have a SYE and replacement CV driveshaft installed. Having the SYE and CV driveshaft installed eliminates the need to still have a transfer case drop installed.

Once we have a couple good sharp well-lighted (use a flash!) photos of the rear underside of your Jeep, we can probably help figure out what is causing your vibrations.
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Old 09-30-2008, 05:38 PM   #5
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im at my fire station right now so i don't have my camera, but i do got a few pics on my computer from a while back, ill see what i can find
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Old 09-30-2008, 05:42 PM   #6
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these are all i got on my computer, hopefully there good enough
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Old 10-01-2008, 10:41 AM   #7
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Good pics, you definitely have a CV driveshaft. However, it's hard to see what the pinion shaft to driveshaft angle is on that first photo. Any chance you can take one more, further back so it shows that angle better? It's hard to say without that additional photo but it almost looks like the rear pinion angle could be a little too high.
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Old 10-01-2008, 10:26 PM   #8
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ill post those as soon as i get a chance. someting i didn't mention earlier, the vibration is felt mainly in the steering and the shifter, dunno if that makes a difference.
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Old 10-01-2008, 10:43 PM   #9
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Quote:
Originally Posted by CVFD76 View Post
the vibration is felt mainly in the steering and the shifter
How about when its on 4wd? (4hi?) any worse?
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Old 10-01-2008, 10:53 PM   #10
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no, only when im in 2wd, its wierd
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Old 10-02-2008, 12:06 AM   #11
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did this recently happened without changes to your suspension? hows the angle on your front driveshaft..

Take some more pictures of the profile for your shafts at an even horizontal level..

and go underneeth your jeep and wiggle the DS to see if there is any play..

and why do you have a TC drop with an sye DS?

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