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Old 02-23-2013, 09:42 AM   #1
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Vibrating noise during takeoff/ slowing

Ill tell you what I have first. 2013 jk Sahara. Put on RK 2.5 stock mod lift and 35 tires. Well the RK lift was a lot more than what it was suppose to b and I ended up buying a lot of extras that if I would have known in the first place could have saved some money. I got a vibrating noise coming from the jeep when i was taking off at low speeds and also when i slowed to a stop

So first thing i think is the ds is in a bind. I bought the rear adj track bar to make sure rear was perfectly centered. Then I bought the front lca's and rear uca's. Got the angled matched perfectly put it back together last night and went on test drive and vibration is still there.

I'm out of ideas on this one. Any suggestions?

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Old 02-23-2013, 09:59 AM   #2
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What are your post lift suspension numbers?

i.e. castor, pinion, toe

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Old 02-23-2013, 10:11 AM   #3
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Join the RK more then 2.5" lift club
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Old 02-23-2013, 10:13 AM   #4
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More of a feel or noise ?
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Old 02-23-2013, 10:14 AM   #5
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Quote:
Originally Posted by kjeeper10 View Post
Join the RK more then 2.5" lift club
They really need to just update their kits to RK ?.?" lifts.
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Old 02-23-2013, 10:16 AM   #6
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Or offer 2 door/4 door coils.
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Old 02-23-2013, 10:18 AM   #7
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They really need to just update their kits to RK ?.?" lifts.


I'm cracking myself up with this one.
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Old 02-23-2013, 10:18 AM   #8
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No no engine ping thank god. I'm not sure of the exact numbers of caster and things. When I first put the uca's on I set them to the length in the instruction book but when I stepped back and looked it turned the rear end so much I had to much angle now in the opposite direction. So I took them off and jacked differential until it was even with the angle of the driveshaft. No measurements I just used a straight edge between the two.
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Old 02-23-2013, 10:19 AM   #9
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Quote:
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More of a feel or noise ?
Both I can feel it and hear it.
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Old 02-23-2013, 10:37 AM   #10
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Stock shafts shouldn't vibe unless their is a problem ie. Bad joint
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Old 02-23-2013, 10:45 AM   #11
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Hold up.... You should have your rear lowers set to around RK's spec and uppers so that the pinion is minus 2 (-2") below the DS.
The pinion pulls up slightly under acceleration.

The front is a fine mix of caster/pinion. You want enough caster where pinion/DS angle is not a problem.
I am at 4" of lift and have it set up for +3 pinion which is more then stock. My caster is low and the jeep handles poorly.
I have a aftermarket shaft so pinion angle is important.

Check you DS rzeppa jjoints and the front u-joint for any damage.
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Old 02-23-2013, 10:53 AM   #12
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My front angle.
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Old 02-23-2013, 12:19 PM   #13
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Depending on the tires you chose and how knobby they are I would say that's the issue. Is it happening at 5mph or less? If so I would bet that's it. My brother lifted his truck and put 35s on it an I asked him what the hell was wrong with it when he was coming to a stop. He said it was the tires. I feel the same thing in my jeep now after the lift and 35s
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Old 02-23-2013, 12:31 PM   #14
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Don't have rear lowers just the uppers and if I set them at 19" like RK says it turns my rear end way to high.

Quote:
Originally Posted by kjeeper10 View Post
Hold up.... You should have your rear lowers set to around RK's spec and uppers so that the pinion is minus 2 (-2") below the DS.
The pinion pulls up slightly under acceleration.

The front is a fine mix of caster/pinion. You want enough caster where pinion/DS angle is not a problem.
I am at 4" of lift and have it set up for +3 pinion which is more then stock. My caster is low and the jeep handles poorly.
I have a aftermarket shaft so pinion angle is important.

Check you DS rzeppa jjoints and the front u-joint for any damage.
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Old 02-23-2013, 12:34 PM   #15
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Quote:
Originally Posted by Dmactampa View Post
Depending on the tires you chose and how knobby they are I would say that's the issue. Is it happening at 5mph or less? If so I would bet that's it. My brother lifted his truck and put 35s on it an I asked him what the hell was wrong with it when he was coming to a stop. He said it was the tires. I feel the same thing in my jeep now after the lift and 35s
I have nitto trail grapplers and yes it's only between 0-5 mph.
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Old 02-23-2013, 01:09 PM   #16
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My money is on the tires.
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Old 02-23-2013, 01:20 PM   #17
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Quote:
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My money is on the tires.
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Old 02-23-2013, 01:47 PM   #18
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Quote:
Originally Posted by DCR-13JK
Don't have rear lowers just the uppers and if I set them at 19" like RK says it turns my rear end way to high.
Whoa ..... Those are not supposed to be run with stock lowers

Says so on the site.
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Old 02-23-2013, 01:48 PM   #19
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You can hear tires ?
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Old 02-23-2013, 01:52 PM   #20
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Tires with side biters or nobbys will rumble or vib at low speed.Toss stock tires back on and I bet it goes away.
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Old 02-23-2013, 02:05 PM   #21
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Quote:
Originally Posted by kjeeper10 View Post
Whoa ..... Those are not supposed to be run with stock lowers

Says so on the site.
Huh???
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Old 02-23-2013, 02:19 PM   #22
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From RK's site -
NOTES!
* Recommend having adjustable lower control arms.

Would you be able to make them shorter to get your pinion angle at -2 ?
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Old 02-23-2013, 02:21 PM   #23
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Quote from RK

"Our rear upper arms are designed to be used with our "longer set" of rear lowers to allow pushing of the rear axle back a little bit. It makes clearing 37's on 2.5" or 3.5" of lift with flat fenders a snap and will have no issues trimming the pinch weld seam..."

RK
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Old 02-23-2013, 02:25 PM   #24
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Quote:
Originally Posted by ohioviper View Post
Tires with side biters or nobbys will rumble or vib at low speed.Toss stock tires back on and I bet it goes away.
^This.
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Old 02-23-2013, 02:30 PM   #25
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Ok we know what is vibe is ... Tires

I am concerned of his angles running arms that may be too long.
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Old 02-23-2013, 02:55 PM   #26
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We are happy that you are concerned about the OP's angles.
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Old 02-23-2013, 05:51 PM   #27
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Quote:
Originally Posted by kjeeper10 View Post
From RK's site -
NOTES!
* Recommend having adjustable lower control arms.

Would you be able to make them shorter to get your pinion angle at -2 ?
Not sure what u mean here. Also not sure what pushing the rear end back would do besides make me need a longer ds. But don't get me wrong I don't know a lot that's why I'm asking.
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Old 02-23-2013, 06:06 PM   #28
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Quote:
Originally Posted by DCR-13JK

Not sure what u mean here. Also not sure what pushing the rear end back would do besides make me need a longer ds. But don't get me wrong I don't know a lot that's why I'm asking.
The more involved kit moves the axle back 1". When you lift, the axles are drawn in. The factory DS has a slip joint which enables it to expand.

What I am saying is. You do not want to run your pinion even with the DS. You want the pinion -2 below the DS.


Those uppers are not intended to be used by themselves (w/o adj lower CA's) because of their length.
I was wondering if you could adjust those arms back enough to actually achieve that -2
According to RK you can't.
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Old 02-23-2013, 06:10 PM   #29
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Old 02-24-2013, 07:13 AM   #30
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Quote:
Originally Posted by kjeeper10 View Post
This is where I found that quote

HELP with Rock Krawler upper rear control arms
Ok now I got ya. Thanks a lot for ur help. Well I guess I'll put my bumpers on hold again and buy some rla's.

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