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Old 01-14-2013, 12:14 PM   #1
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Vibs after installed adjustable lower control arms?

I installed some teraflex adjustable lower control arms and now im getting vibs around 60 mph. It feels as if I have a off balanced tire but I rotated/ balanced all 4 and still the same issue. I also put the Jeep on a alignment rack to make sure the font axle was centered. It was a few degrees off so adjusted it within spec. I didnt have this issue when I had the OE arms on.
2" BB 1.25" BL 33x10.5

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Old 01-14-2013, 12:19 PM   #2
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Were the tf arms new or used?

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Old 01-14-2013, 12:19 PM   #3
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what arms did you install? front or rear? what joints on are each end? what eye-to-eye length did you set them at? if the rear, did you align the pinion angle for the type of shaft you have, and if the front, what did you set caster at?
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Old 01-14-2013, 12:28 PM   #4
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Quote:
Originally Posted by lynn View Post
Were the tf arms new or used?
Used but they where re-built to new or better condition.

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what arms did you install? front or rear? what joints on are each end? what eye-to-eye length did you set them at? if the rear, did you align the pinion angle for the type of shaft you have, and if the front, what did you set caster at?
All four lower arms. The adjustable ones where set to the same length as the OE ones. My caster was 6 on the driver and 6.5 on the passenge. My pinion angle was 8 off the diff, and I wanna say 9 off the transfer case output shaft. But I dont remember. I know everything was within spec. I have the OE drive shaft.

These are the arms.
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Old 01-14-2013, 01:00 PM   #5
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what arms did you install? front or rear? what joints on are each end? what eye-to-eye length did you set them at? if the rear, did you align the pinion angle for the type of shaft you have, and if the front, what did you set caster at?

All 4 arms were set at 15 3/4". His pinion angle and caster angles were the same after the install as before. (I know, I installed these). Like I said Trav, I'd bet the issue causing your vibes was there before, but you can now feel it since you went from soft (worn out) clevite bushings to brand new, tight poly bushings.
I don't remember the measurements, but they were good, and stock length control arms shouldn't cause any issues with a 2" spring spacer on stock springs.
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Old 01-14-2013, 01:03 PM   #6
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All 4 arms were set at 15 3/4". His pinion angle and caster angles were the same after the install as before. (I know, I installed these). Like I said Trav, I'd bet the issue causing your vibes was there before, but you can now feel it since you went from soft (worn out) clevite bushings to brand new, tight poly bushings.
But what would be causing it? If my drive line angles are all good then why am I getting vibs.
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Old 01-14-2013, 01:04 PM   #7
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I don't know. A drive line angle issue or bad u-joint, etc., will almost always show up well before 60mph, and throttle application will usually change the vibration.
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Old 01-14-2013, 01:06 PM   #8
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Are your wheels true? Are your tires round? (seriously) Are your wheel bearings tight? Is your tranfer case output shaft tight? Is the slip yoke tight?
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Old 01-14-2013, 01:06 PM   #9
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Are your U-joints tight? Does your driveshaft turn true? Are your axle shafts true?
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Old 01-14-2013, 01:06 PM   #10
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ahh, the old poly bushing Teraflex bracket destroyers....
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Old 01-14-2013, 01:11 PM   #11
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Pull a shaft and go for a drive. Repeat. Quit guessing and start getting down to business if you want to find the source of the vibes.
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Old 01-14-2013, 01:12 PM   #12
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Pull a shaft and go for a drive. Repeat. Quit guessing and start getting down to business if you want to find the source of the vibes.

That's what I'm saying....
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Old 01-14-2013, 01:13 PM   #13
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Pull a shaft and go for a drive. Repeat. Quit guessing and start getting down to business if you want to find the source of the vibes.
I was thinking of pulling the rear shaft to see that happens.
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Old 01-14-2013, 01:15 PM   #14
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I was thinking of pulling the rear shaft to see that happens.

Yes. Then, if nothing changes, put it back in and pull the front.
Like I told you the day I installed those- you need to spend more time UNDER your Jeep.
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Old 01-14-2013, 01:15 PM   #15
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Wednesday I'll pull the rear shaft and start making sure things are tight.
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Old 01-14-2013, 01:17 PM   #16
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Those worn out shock bushings and sway bar links certainly aren't helping, either. It can be tough to pinpoint a problem without fixing everything else first. In fact, a slightly out of balance or out of round tire combined with worn out shock bushings could be a factor.
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Old 01-14-2013, 01:22 PM   #17
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Those worn out shock bushings and sway bar links certainly aren't helping, either. It can be tough to pinpoint a problem without fixing everything else first.
Dont wanna get shocks till I can install the springs. Doesnt make sense to buy shocks just to replace them in a few months with longer ones.
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Old 01-14-2013, 01:25 PM   #18
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Dont wanna get shocks till I can install the springs. Doesnt make sense to buy shocks just to replace them in a few months with longer ones.
So find some bushings and replace them. Or ignore the vibes (not a good idea) until you can fix the current issues. To tell you the truth, when you first mentioned you had vibes, I had forgotten about all your worn out bushings.
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Old 01-14-2013, 01:34 PM   #19
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I looked for bushings. The only ones I found for the shocks I have wont work. The bushings cant be replaced on the shocks I have.
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Old 01-14-2013, 01:40 PM   #20
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I've never seen a shock you couldn't replace the bushings on. They put them in, they'll come out. They didn't build the shock around the bushing.
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Old 01-25-2013, 11:47 PM   #21
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Wednesday I'll pull the rear shaft and start making sure things are tight.
What did you find?
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Old 01-26-2013, 03:06 AM   #22
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Pulled it still had vibs. Gave Erynne and her dad a ride home one night, she sat in the back behind me and she said she could feel it more sitting there than she could sitting in the passenger seat. This was after I put the drive shaft back. Next day I'm off I'm gonna rebalance my tires again.
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Old 01-26-2013, 10:43 AM   #23
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Pulled it still had vibs. Gave Erynne and her dad a ride home one night, she sat in the back behind me and she said she could feel it more sitting there than she could sitting in the passenger seat. This was after I put the drive shaft back. Next day I'm off I'm gonna rebalance my tires again.
Make sure you watch for an out-of-round tire. They can be out of round and still balance. One of mine doesn't spin very true, but it balances fine. It runs out fine until about 70mph. It's now my spare.
Did you pull the front shaft?
Tire balance vibrations and drive line vibrations feel totally different.
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Old 01-26-2013, 10:51 AM   #24
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I didn't pull the front. But it feels like a tire out if balanced. I know what that feels like.
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Old 01-26-2013, 10:58 AM   #25
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BFG's never were the best balancing tire. They've been like that since I can remember. Also keep in mind, the M/T's won't run out as smooth as an A/T.

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