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Unread 01-03-2012, 08:45 PM   #1
jeeprookie15
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Bad YJ Vibrations

Alright, so i bought a Rough Country 4" lift with the n2.0 shocks and put it all on and bought some 33" tires. Tightened everything down and took it out for a drive. Everything was fine but once i hit about 45 mph it started vibrating BAD. I could hear it like when you start to run off the road on the interstate. The lift kit came with driveshaft drop brackets so im thinking its not that but i could be wrong. Going to get my tires checked for alignment soon to see if thats it, but do any of you guys have any solution??

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Unread 01-03-2012, 08:54 PM   #2
Irongrave
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are you running any sort of SYE or transfer case drop. my guess is your drive shaft angles suck and need to be addressed. with shims and an SYE
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Unread 01-03-2012, 08:57 PM   #3
dillonjm
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Where was the vibration, steering wheel? Seat of the pants?

First step is to narrow it down to driveline or steering/wheel balance.
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Unread 01-03-2012, 09:03 PM   #4
jeeprookie15
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oh sorry i meant to say transfer case drop not driveshaft drop, and im running a stock driveshaft. I couldnt really tell where the vibration was directly coming from, but the WHOLE thing was shaking pretty badly. Im pretty sure people i drive by can hear it lol. Also, could it be that i put something on wrong on the lift kit or something isnt tight enough??
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Unread 01-03-2012, 09:12 PM   #5
dillonjm
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Quote:
Originally Posted by jeeprookie15 View Post
oh sorry i meant to say transfer case drop not driveshaft drop, and im running a stock driveshaft. I couldnt really tell where the vibration was directly coming from, but the WHOLE thing was shaking pretty badly. Im pretty sure people i drive by can hear it lol. Also, could it be that i put something on wrong on the lift kit or something isnt tight enough??
Just to rule out the possible obvious. Did you have the tires balanced? Check the lug nuts to make sure they are tight.

I'd run through and check the suspension bolts also. U-bolts should be 80ish, shackles anywhere from 45-70 depending on which school of thought you buy into regarding shackle bolt tightness.

Not sure if you opted to keep the track and sway bars or not, you can check those, but if the leaf springs' bolts are torqued correctly you can remove both with no issue.

The whole Jeep vibration leads me to believe its suspension/steering/tire balance related. Were it driveline it should just feel like a rythmic vibration in the butt (so to speak).
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Unread 01-03-2012, 09:18 PM   #6
jeeprookie15
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I just got the tires mounted and balanced. It came with new sway bar links and a track bar relocation bracket. Thanks for the torque specs on the leaf spring and shackles because i didnt know exactly how tight they were supposed to be. I just tightened them down with an air wrench. Any new thoughts or you still think its suspension/steering/tire balance??
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Unread 01-04-2012, 05:13 AM   #7
bogleparsons
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The kit came with a transfer case drop. Use it.

Your angles are probably off, can you take some pictures of the drives haft angles and post?

You may also need shims under your leafs if the TC drop doesn't alleviate the vibrations.
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Unread 01-04-2012, 05:18 AM   #8
jeeprookie15
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I did use it!
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Unread 01-04-2012, 06:09 AM   #9
jbeebe
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so do you feel the vibrations in your steering wheel or the pedal? i understand you said the whole thing was shaking, but does the steering wheel shake back and forth too?

did you use shims in the rear?
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Unread 01-04-2012, 06:40 AM   #10
19renegade91
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Driveshaft is reverse maybe like upaide diwn...mine was all I did was change unis and flip it over . Or flip the slip yoke either way it was installed wrong
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Unread 01-04-2012, 06:42 AM   #11
19renegade91
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Even if u marked it it could have been installe.d wrong before just try flipping it
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Unread 01-04-2012, 06:44 AM   #12
danlee
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Go to harbor freight and purchase this
http://www.harborfreight.com/dial-ga...der-34214.html
Check and make sure your drive line is around 22 degrees, this is ideal for you rear drive line
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Unread 01-04-2012, 03:36 PM   #13
meSiLlY
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My front drive shaft caused vibrations when I jumped on the highway. Around that same speed too. Make sure to check, not only the ujoints, but the slip joint on the front shaft. The rear shaft can have some play and you really won't notice it. If the front shaft has any play, in the slip, at all (since it is longer)... you will know it!

Don't ask how I know...
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Unread 01-04-2012, 03:52 PM   #14
hfa8592
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I have a problem with my '93 I think as well, but it doesn't happen until I'm up to about 65. I have since replaced the rear springs and all four shocks, replaced the tie rod (& ends) along with the steering stabilizer, had an alignment and had the tires balanced. I have also replaced the ujoints on the rear drive shaft. The vibration is the same with or without the front & rear track bars. Doesn't make any kind of sound like that though. I can't figure it out.
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Unread 01-04-2012, 06:02 PM   #15
jplks2play
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did you tighten shackles before putting the weight of the jeep on them?
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