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Old 03-27-2016, 11:42 AM
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Vibration or knobbies?

Suspension work is finally complete, wheels and tires mounted, alignment also complete.

Jeep tracks straight with expected feel of the anti-rock.

There is no wobble or bump steer, but seems to be a very fine vibration.

How can I tell if it is a true vibration or just fresh knobbies on the BFG KO2s?

Pics are just for fun.

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Old 03-27-2016, 11:51 AM   #2
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those arent exactly knobbies, and should run perfectly smooth.

you can rotate the tires to see if the vibration moves with them, then a re-balance would be necessary.

how much lift did you install? is it a speed sensitive vibration? tire psi?

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Old 03-27-2016, 12:43 PM   #3
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What psi are the tires at?
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Old 03-27-2016, 12:50 PM
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I did 4 inches of lift and tires are all 32 psi

Can't really tell if it's speed sensitive. Seems constant
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Old 03-27-2016, 12:52 PM   #5
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32psi is too high. What size, 33", 35"?
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Old 03-27-2016, 12:54 PM
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These are 35 inch tires and the pollen pick up on the tires is definitely more on the middle 2/3 of the tire and not all the way accros
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Old 03-27-2016, 12:55 PM   #7
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drop transfer case with 4" lift?

try 22-26psi for 35's
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Old 03-27-2016, 12:55 PM   #8
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You should be down around 26psi for 35" tires....
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Old 03-27-2016, 12:57 PM
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Wow 26! I will try it.

No drop of the t-case.
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Old 03-27-2016, 01:01 PM   #10
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Wow 26! I will try it.

No drop of the t-case.
new rear cv drive shaft with adj upper and lower control arms?

if not, then vibes are to be expected
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Old 03-27-2016, 01:25 PM
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Yep did a read drive shaft and all 8 adjustable control arms
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Old 03-27-2016, 01:37 PM   #12
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and its installed like the pic below?



if so, then i'd start by either rotating tires to see if the vibe changes or pull each drive shaft, one at a time, and go for a test drive. if the vibe goes away, you know where its at
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Old 03-27-2016, 01:38 PM   #13
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I would try tire pressure 1st. I have 31" ko2 tires and my chalk test gave me 28 psi.
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Old 03-27-2016, 01:42 PM
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I think so. Thank you all for the advice. I have some things to try
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Old 03-27-2016, 01:44 PM
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Just aired down to 26 and going to ride to the gym.

Vibration is very subtle, so hopefully just air pressure
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Old 03-27-2016, 01:46 PM   #16
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your pinion may be just a bit low, but pics can be deceiving
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Old 03-27-2016, 04:45 PM
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Air pressure at 26 helped, but still slight vibration starts around 18-20 mph. Might try a little lower before I rotate

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