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Old 01-05-2013, 06:31 AM   #1
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Vibration After Lift Kit Installation

I just installed a 3.75" RC combo body/suspension lift: Jeep TJ Suspension Lift, and am getting a vibration underneath the vehicle that seems to increase at higher speeds.

Any suggestions on how to solve this problem?

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Old 01-05-2013, 06:39 AM   #2
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I just bought a 1997 jeep sport that is lifted and once I hit 65mph it starts shaking and as I increase the speed it gets worse. I am taking it over to my mechanic to have it looked at. I will report back once we get it figured out. I am hoping it is just tire balance or alignment?????

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Old 01-05-2013, 07:22 AM   #3
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Old 01-05-2013, 07:30 AM   #4
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While it is possible you have a bad U-joint or some other issue, the most likely (and I do mean very likely) cause is you rear drive line angle causing vibration.

First question is did you lower your transfer case (if my memory serves some of the RC spring lift kits don't come with transfer case spacers)?

If it turns out to be driveline vibration, there are some threads here that are really worth looking at. People a lot smarter than me have posted very good information about what causes those vibrations after lifing your TJ and how to solve the problem.
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Old 01-05-2013, 07:38 AM   #5
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looks like Unlimited and I were typing at the same time . He is one of those "people a lot smarter than me" I was talking about and ya, the SYE and double cardon joint drive shaft is the way to go.
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Old 01-05-2013, 03:38 PM   #6
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The only correct way to eliminate driveline vibration is to start with a balanced drive shaft, good quality u joints and then set your output and input angles parallel with a protractor, making sure that both working angles are the same! If they are not the same then one will always depending on rotation be trying to turn faster than the other, plus the larger the working angle is the more sever the vibration will be!
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Old 01-06-2013, 10:07 PM   #7
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All, Thanks for the quick feedback; its enough to get me on my way.
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Old 01-06-2013, 10:57 PM   #8
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Quote:
Originally Posted by propatria87 View Post
I just installed a 3.75" RC combo body/suspension lift: Jeep TJ Suspension Lift, and am getting a vibration underneath the vehicle that seems to increase at higher speeds.

Any suggestions on how to solve this problem?
Like they say, all TJ's are different. I have the same exact springs that you have in that kit with no t-case drop, mml, sye or anything and I have never felt any vibrations. Just a couple of days ago I pushed her to a bit over 80 mph (don't ask why, I'm not even sure myself) and I didn't feel any vibrations at all.
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Old 01-06-2013, 11:04 PM   #9
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Quote:
Just a couple of days ago I pushed her to a bit over 80 mph (don't ask why, I'm not even sure myself)
Not to hijack, but I'm wondering about this statement. Is there something wrong with your Jeep?
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Old 01-07-2013, 07:15 AM   #10
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Not to hijack, but I'm wondering about this statement. Is there something wrong with your Jeep?
No, why do you ask?
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Old 01-07-2013, 07:21 AM   #11
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because the governor usually kicks in at 60. How'd you bypass it?
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Old 01-07-2013, 07:48 AM   #12
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No, why do you ask?

It sounded like you were afraid to run it over 80mph.
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Old 01-07-2013, 11:10 AM   #13
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because the governor usually kicks in at 60. How'd you bypass it?
Ummmm, don't know. Guess it doesn't have one.


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It sounded like you were afraid to run it over 80mph.
Actually, I have gotten it up to 90. Doesn't feel too safe with the 33" tires and hydro shocks at those speeds.
I usually keep it between 65-70 on the interstate. Any more than that and it sucks gas really bad.
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Old 01-07-2013, 11:12 AM   #14
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Ummmm, don't know. Guess it doesn't have one.




Actually, I have gotten it up to 90. Doesn't feel too safe with the 33" tires and hydro shocks at those speeds.
I usually keep it between 65-70 on the interstate. Any more than that and it sucks gas really bad.

Just curious. I set the cruise @80-85mph on the interstate with 32's and 2" springs, 1.25" BL, hydro shocks, etc.
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Old 01-07-2013, 11:21 AM   #15
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with only 2.5" of suspension lift you should be able to do a 1" mml and maybe a couple washers as spacers to drop the transfer case skid a little. That should be enough to get you rolling vibe free again if DS is ok to begin with.
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Old 01-07-2013, 04:39 PM   #16
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Took it to a shop with the Road Force Balancer. They told me that not one of the tires had any weights on it??
They said it took an unusual amount of weight to get it balanced and they said they did the best they could. I took it out on the highway and it ran much better. I got up to 80 mph and all was good.
Not sure why they needed so much weight. (rims maybe?). The guy I bought from said he only put 4500 miles on it since 2005, could sitting that often cause flat spots on the tires. (33" BFG All Terrains).
I do mostly back roads to work so I might as well run these for as long as they last then replace with new when needed.

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