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Old 03-13-2012, 01:20 PM   #1
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Reducing vibes

So on the Jeep I recently purchased I have the vibes...
More precisely I get vibration at 30 and 50 under acceleration.
I just replaced both rear driveshaft u-joints to eliminate that as a possible issue. The PO did replace the rear axle with a ford 9 inch which he has install papers for and it has a new driveshaft also but has lost the paperwork on that.
Now after researching I have concluded that it is probably due to the 4 inch lift that makes it vibrate. It appears to be this lift kit:
ProComp Suspension Part K3056B - 4" Lift Kit with ES3000 Shocks by Pro Comp

Now as I cannot afford to go the whole SYE route I was wondering if I can just replace the springs with something a little shorter. It does have a T-case drop so I thought if I could get it to more of a 2.5 or 3 inch lift it might stop the vibes. Will control arms and sway bars and such need to be replaced or can I just shorten the springs and be done with it? I attached a couple of pics of my underside in case someone see something else obviously in need of repair..
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Old 03-13-2012, 01:25 PM   #2
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Mml?

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Old 03-13-2012, 01:27 PM   #3
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is the transfer case dropped?
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Old 03-13-2012, 01:32 PM   #4
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Quote:
Originally Posted by JerkyBoy View Post
So on the Jeep I recently purchased I have the vibes...
More precisely I get vibration at 30 and 50 under acceleration.
I just replaced both rear driveshaft u-joints to eliminate that as a possible issue. The PO did replace the rear axle with a ford 9 inch which he has install papers for and it has a new driveshaft also but has lost the paperwork on that.
Now after researching I have concluded that it is probably due to the 4 inch lift that makes it vibrate. It appears to be this lift kit:
ProComp Suspension Part K3056B - 4" Lift Kit with ES3000 Shocks by Pro Comp

Now as I cannot afford to go the whole SYE route I was wondering if I can just replace the springs with something a little shorter. It does have a T-case drop so I thought if I could get it to more of a 2.5 or 3 inch lift it might stop the vibes. Will control arms and sway bars and such need to be replaced or can I just shorten the springs and be done with it? I attached a couple of pics of my underside in case someone see something else obviously in need of repair..
I see you mentioned a TC drop, but are you sure it's dropped as your rear axle looks to be at a huge angle? Take a pic of the TC from the side view.

Typically, your type of vibes (from what I've studied on this forum) come from drive lines....
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Old 03-13-2012, 01:42 PM   #5
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As requested, the side view. Also one from the back for good measure
Thanks for the help
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Old 03-13-2012, 01:43 PM   #6
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oh my bad, i see where you say the TC drop.. i'd go with bombproof motor mounts or something similar to give it a 1" lift, which will help tilt the drivetrain down and assist with correcting the angles.
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Old 03-13-2012, 01:49 PM   #7
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Originally Posted by darkproximity View Post
oh my bad, i see where you say the TC drop.. i'd go with bombproof motor mounts or something similar to give it a 1" lift, which will help tilt the drivetrain down and assist with correcting the angles.
This would require the fan shroud to be raised since I have no body lift on it correct? And would possibly help with the vibes?
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Old 03-13-2012, 01:55 PM   #8
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doubt you'd need to move the fan shroud, but i could be wrong, and yes it should help with the vibes. It would benefit you to get an angle finder, and figure out what your rear pinion angle is, in relation to the driveshaft angle.

In most cases with a 4" lift and a transfer case drop, and the ones that I've helped install on TJs, a 1-1.25" transfer case drop was all that was needed to eliminate vibrations, which most of the cheaper kits come with to address the vibration issue. I'm guessing based on pro-comp's reputation, they provided the bare minimum in their lift kit, and perhaps the PO made his own transfer case drop. You might get away with adding a few washers in between the frame and the spacer used in the t-case drop as well.. so you have a few options here
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Old 03-13-2012, 02:00 PM   #9
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You should price out a SYE compared to replacing the springs, motor mounts, time and labor...and I think it will be about the same. SYE would take care of the angle, and if the vibrations are in the drivetrain...but have you also checked tire balance, tread wear, or even a sidewall bulge? I've had all those problems over the years produce a vibration at certain speeds...
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Old 03-13-2012, 02:05 PM   #10
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Originally Posted by darkproximity View Post
doubt you'd need to move the fan shroud, but i could be wrong, and yes it should help with the vibes. It would benefit you to get an angle finder, and figure out what your rear pinion angle is, in relation to the driveshaft angle.

In most cases with a 4" lift and a transfer case drop, and the ones that I've helped install on TJs, a 1-1.25" transfer case drop was all that was needed to eliminate vibrations, which most of the cheaper kits come with to address the vibration issue. I'm guessing based on pro-comp's reputation, they provided the bare minimum in their lift kit, and perhaps the PO made his own transfer case drop. You might get away with adding a few washers in between the frame and the spacer used in the t-case drop as well.. so you have a few options here
I agree... IMO, the TC drop spacers look "homemade" and may not be the right length. I also agree in checking you pinion angle... But unless you have adjustable rear upper control arms, you can't do anything about it should it be off a degree or two??

I'm sure what ever it is, it's an easy fix if we can pin point the problem.
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Old 03-13-2012, 02:06 PM   #11
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Originally Posted by NHrubicon View Post
You should price out a SYE compared to replacing the springs, motor mounts, time and labor...and I think it will be about the same. SYE would take care of the angle, and if the vibrations are in the drivetrain...but have you also checked tire balance, tread wear, or even a sidewall bulge? I've had all those problems over the years produce a vibration at certain speeds...
I do have tire bulges on a couple of tires. I was told when I had them checked after purchase that they were manufacturer overlapping belts and that they would be fine. Did not think this would cause vibrations at only certain speeds but might try and check that out. thanks for advice!
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Old 03-13-2012, 02:39 PM   #12
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I am in this same boat and hoping to get some info from this thread. 3" lift with TC drop and vibes.
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Old 03-13-2012, 03:09 PM   #13
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I am in this same boat and hoping to get some info from this thread. 3" lift with TC drop and vibes.
Yeah not sure how exactly to test the tires.If I take them to a shop and have them balanced will that mean the tires are not the culprit if they are able to balance them?
I actually do have a spare set of rims but not the wheels to put on in order to see if that causes the vibration. Doubt my local tire place will let me try on a set. Hate to buy new tires just as a test since the ones on there are almost brand new.

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