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Unread 07-01-2013, 09:43 PM   #1
AK49
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vibrations at certain speeds

Looking for some ideas on why i'm getting vibrations at certain speeds. Vibrations will kick in from 10-20 and around 30-35 and 50-55. Coilover lift was installed along with 35" Toyo MT's and new driveshafts. Anything I can do to help narrow down the problem?

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Unread 07-01-2013, 10:55 PM   #2
Tbasham
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Make sure the tires are properly balanced and your drive shaft angles are correct.
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Unread 07-02-2013, 09:50 AM   #3
AK49
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Originally Posted by Tbasham View Post
Make sure the tires are properly balanced and your drive shaft angles are correct.
Thanks! I had the tires balanced before going on. You think I should have them rebalanced? Also when the lift was installed, new 1350 drive shafts were also installed.
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Unread 07-02-2013, 09:59 AM   #4
Tbasham
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What size lift and do you have adjustable control arms?
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Unread 07-02-2013, 10:02 AM   #5
C2U5H
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have someone turn the steering wheel back and forth with the jeep on while you look at the components up front. looking for moving hardware or any component that seems to move within its mount. most likely your axle-side track bar mount. alignment's easy since we have knuckle to knuckle tie rods, so i'm assuming that's not it.
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Unread 07-02-2013, 10:07 AM   #6
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No info on this in the profile , but I will put on my mindreading hat. Sounds like the start of DW. we are talking about the FRONT right? It is a Jeep cj-jk? Its old or new?

Why? Because a new Jeep we can safely say it is not the ball joints, tre's carrier bearing, drag link etc..

But we know you lifted something and put 35"s. Sounds like the lift is not installed correctly and or something wore out. Going 35"s brings out the unknown DW in used jeeps. If its new your install is off or the lift might be cr@p for the height. check all bolts, be sure to have tightened all suspension joints with the Jeep on the ground with the jeeps weight on it.

read the DW thread sticky
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Unread 07-02-2013, 10:52 AM   #7
AK49
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Originally Posted by 222Doc View Post
No info on this in the profile , but I will put on my mindreading hat. Sounds like the start of DW. we are talking about the FRONT right? It is a Jeep cj-jk? Its old or new?

Why? Because a new Jeep we can safely say it is not the ball joints, tre's carrier bearing, drag link etc..

But we know you lifted something and put 35"s. Sounds like the lift is not installed correctly and or something wore out. Going 35"s brings out the unknown DW in used jeeps. If its new your install is off or the lift might be cr@p for the height. check all bolts, be sure to have tightened all suspension joints with the Jeep on the ground with the jeeps weight on it.

read the DW thread sticky
My fault. Lift is an EVO 4" Long Arm with Coilovers. It's on a 13 JKUR. Driveshafts were also replaced the same time the lift was done. The vibration at 10-20 is most noticeable. The vibrations at 30-35 and 50-55 is very mild (can't even feel it through the steering wheel).
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Unread 07-02-2013, 10:54 AM   #8
AK49
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Originally Posted by Tbasham View Post
What size lift and do you have adjustable control arms?
It's a 4" evo long arm with coilovers. It's set at 3" right now. It does have adjustable control arms.
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Unread 07-02-2013, 11:00 AM   #9
boon4376
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Quote:
Originally Posted by AK49 View Post
Thanks! I had the tires balanced before going on. You think I should have them rebalanced? Also when the lift was installed, new 1350 drive shafts were also installed.
Some places just do a terrible job balancing tires... So it could be as simple as that.
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Unread 07-02-2013, 11:56 AM   #10
Tbasham
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Since you have the rubicon make sure both of your pinion angles are set and pointing right at the ouput of the transfer case. If your pinion angles are correct, that will eliminate your driveline as the cause, I doubht the driveshafts are out of balance since they are new.
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Unread 07-02-2013, 02:26 PM   #11
AK49
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Quote:
Originally Posted by Tbasham View Post
Since you have the rubicon make sure both of your pinion angles are set and pointing right at the ouput of the transfer case. If your pinion angles are correct, that will eliminate your driveline as the cause, I doubht the driveshafts are out of balance since they are new.
I took a few pictures of the driveshaft (sorry about the crappy quality. It's a pain getting a full shot of the entire front driveshaft. I'm completely confused about the angles. Does this look totally off?
dsc00476.jpg   dsc00478.jpg   dsc00479.jpg   dsc00480.jpg  
dsc00477.jpg

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Unread 07-03-2013, 01:00 PM   #12
Tbasham
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It looks like from those pictures your pinion needs to be angled up a little bit more. Here is a link to a picture that explains the whoel angle situation better. For your front and rear axles you will want them like ti shows in the picture for a CV driveshaft.

http://www.jeepforum.com/forum/f9/un...angles-763367/
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Unread 07-03-2013, 01:16 PM   #13
Tbasham
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http://www.4xshaft.com/driveline101.asp

here is where that picture came from. Also this is a good read that will explain why you need adjustable control arms with that much of a lift. In theory you can drive like you are and just ignore the vibrations, you will just wear out your u-joints much much faster.
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Unread 07-03-2013, 04:42 PM   #14
AK49
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Quote:
Originally Posted by Tbasham View Post
It looks like from those pictures your pinion needs to be angled up a little bit more. Here is a link to a picture that explains the whoel angle situation better. For your front and rear axles you will want them like ti shows in the picture for a CV driveshaft.

http://www.jeepforum.com/forum/f9/un...angles-763367/

This is a stupid question...but if I adjust the lower control arms to set the driveline angles so they're more in line. Will it cause any issues (assuming there are no major drivability issues) if it takes a few days before I can get it to be realigned?
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Unread 07-03-2013, 11:28 PM   #15
motoguy1251
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Not to thread hi jack, but what are the stock drive shafts considered as. There is no U joints in the rear and just one on the front. So does that make both shafts a cv joint. ALso what should pinion angles be for various normal lifts: say- 2.5 to 3.5 in lifts?
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