Front end bottoming out on 2015 JK, help - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 55 Old 06-29-2015, 05:17 AM Thread Starter
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Front end bottoming out on 2015 JK, help

I just purchased a brand new 2015 JK Rubicon and had it built up. I am running 37s with Bilstein 5100 shocks and 3.5" midarm Rock Krawler lift. Heres my issue that maybe someone can help with. When Im driving on pavement say a flat road and then start up a steeper hill or up my steep driveway, I am hearring a bottoming out noise from up front. Also if im going fast on the backroads and catch a little air over a small bump in the road this happens. I dont know whats causing this, the builder of the Jeep left the factory bump stops on! Would this be because of the bumpstops? Any ideas or help is always appreciated.
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post #2 of 55 Old 06-29-2015, 05:46 AM
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I recommend you post a pick of your bump stops and springs.

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post #3 of 55 Old 06-29-2015, 05:49 AM
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The factory bump stops are just some foam snubbers. There should also be some supplemental bump stop pads added to match the needs of the lift, shocks, tire clearance, etc. Not sure if this is still the case but RK used to not supply bump stop extensions with their kits, leaving that for the installer to determine. That might be the issue you're having.


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post #4 of 55 Old 06-29-2015, 06:44 AM
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On the site under the lift kit you run.

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2007 JKR | PSC Big bore box | Rock Krawler 3.5" x-factor arms l SteerSmarts YETI track bar, tie rod, no drill flipped drag link, Griffin | Synergy frame brace | 37x12.5x17 Nitto RG's | Dana front DS | Fox IFP shocks | Artec front armor kit/Currie JJ's | Teraflex rear axle bracket | EVO Rockstars | Ridged D's, A pillar mounts | VKS sliders l Trek Armor seat covers | Superchips/Sprint booster | Savvy half doors w/ Bestop uppers
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post #5 of 55 Old 06-29-2015, 07:37 AM
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Quote:
Originally Posted by joeydominick View Post
I just purchased a brand new 2015 JK Rubicon and had it built up. I am running 37s with Bilstein 5100 shocks and 3.5" midarm Rock Krawler lift. Heres my issue that maybe someone can help with. When Im driving on pavement say a flat road and then start up a steeper hill or up my steep driveway, I am hearring a bottoming out noise from up front. Also if im going fast on the backroads and catch a little air over a small bump in the road this happens. I dont know whats causing this, the builder of the Jeep left the factory bump stops on! Would this be because of the bumpstops? Any ideas or help is always appreciated.
not definitely your issue and only an alternative (with the quick read through of your symptoms that I could manage this morning due to work) idea for you to check ; the 5100s on my (light at 4780lbs) JKUr turned out to have a bent shaft & displayed similar symptoms. Running them fast or hard on 37s can take a toll and it wouldn't hurt to actually remove the front shocks to take a check of their condition. I moved to 5160s and am very happy with them , only discovering the shaft bend due to the upgrade and a bent stock LCA bracket. Just an idea in hopes to help ya out....


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post #6 of 55 Old 06-29-2015, 07:38 AM
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Like others mentioned. Pics of how the builder set everything up would help a ton... This should be pretty easy...

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post #7 of 55 Old 06-29-2015, 01:59 PM Thread Starter
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I'll get pics in about 30 min.
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post #8 of 55 Old 06-29-2015, 02:48 PM Thread Starter
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post #9 of 55 Old 06-29-2015, 03:12 PM
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Are you hearing tire rub on plastic or a clunk?

You definitely aren't bottoming out, but you should check the bolts on the tops of your shocks to ensure that they are tight. It the little bushings aren't bulging slightly then you're likely hearing your shock knocking around in the mount.

Unrelated but your front track bar at the axle needs help. You need to loosen the jam nut if it hasn't already loosened itself and straighten the joint in the mount. Then hold the joint straight up and down in the mount as best you can and tighten the jam nut back down. The way its in there it will eventually work itself loose due to the leverage the mount has on the joint.

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post #10 of 55 Old 06-29-2015, 03:19 PM Thread Starter
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No I am hearing an scrap sound like metal on pavement. Also what bolt are you saying to loosen, in what pic is it visible ?
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post #11 of 55 Old 06-29-2015, 03:25 PM Thread Starter
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The bolt right in middle of picture right
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post #12 of 55 Old 06-29-2015, 03:26 PM Thread Starter
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From bottom of picture, the bolt diagonal to the right
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post #13 of 55 Old 06-29-2015, 03:29 PM
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Marcus is refering to the axle side joint on your track bar, it should not be flopped over on the shoulder of the spherical ball like that. See picture.
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post #14 of 55 Old 06-29-2015, 03:34 PM Thread Starter
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This right, I've loosened it now do what
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post #15 of 55 Old 06-29-2015, 03:45 PM
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It should look like this staring at the very end of the track bar between the frame mounting bracket AFTER it has been tightened down.
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Some folks are fine with being screwed over, perhaps finding confrontation to be more stressful than just living with whatever the problem is. These are excellent consumers, manufactured to the finest specifications.
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post #16 of 55 Old 06-29-2015, 03:45 PM
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Well, if the track bar heim is not oriented correctly, can you send us pics of the track bar itself to see if it is oriented correctly? There could a lot of little detail things throwing you off, but should be easy to correct.

With how much compression you have, conventional bottoming out is probably not a big concern...

RK
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post #17 of 55 Old 06-29-2015, 03:47 PM
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A second glance at that axle side bracket, is that dirt around the bolt head or has that bolt been traveling in a circle taking the powercoat with it?

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post #18 of 55 Old 06-29-2015, 03:48 PM Thread Starter
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Better? Sorry guys this is all new to me, if I didn't correct this what would happen?
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post #19 of 55 Old 06-29-2015, 03:49 PM Thread Starter
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I can't see your pics can you text me guys this may be easier. 7249610670
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post #20 of 55 Old 06-29-2015, 03:53 PM
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Quote:
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No I am hearing an scrap sound like metal on pavement. Also what bolt are you saying to loosen, in what pic is it visible ?
There is NO way you are scraping metal on pavement. Not from the suspension anyway, unless a control arm is loose and flopping around.

Also, if you are getting air while cruising on back roads you need to slow the fuck down. Jeeps are pretty bad ass, but they are NOT meant to be jumped, you will break an axle in half doing that.

Jeepless
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post #21 of 55 Old 06-29-2015, 03:57 PM Thread Starter
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No I baby this, I mean when I'm cresting a hill at like 35mph I hear a slight brief scrap!



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post #22 of 55 Old 06-29-2015, 04:00 PM Thread Starter
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post #23 of 55 Old 06-29-2015, 04:31 PM
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Looks good on the track bar now. Make sure you got that bolt tight. Tight as in 130-140 ft lb tight.

Things look pretty good otherwise. If you're working the suspension really hard the track bar might be hitting the diff cover, but I doubt that you would hear that at all.

Hard to say what is going on based on your description, but you aren't bottoming out.


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post #24 of 55 Old 06-29-2015, 04:39 PM
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Quote:
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No I baby this, I mean when I'm cresting a hill at like 35mph I hear a slight brief scrap! [/URL]
At the crest of a hill? Or at the bottom of the hill?

Factory fenders? Will the 3.5" on 37's clear factory flares?
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post #25 of 55 Old 06-29-2015, 04:42 PM
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At the crest of a hill? Or at the bottom of the hill?

Factory fenders? Will the 3.5" on 37's clear factory flares?
That is a good point. If it is an X-Factor and you have a factory rear bumper odds are you're rubbing on it.


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