Thump thump flap flap..under my feet - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-15-2013, 10:28 AM   #1
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
Thump thump flap flap..under my feet

Intermittent thump thump/flap flap that I can hear and feel under my feet....the passenger can also feel it. I noticed it with my doors on but am much more aware of it with doors off....smooth roads I can feel/hear it...rough roads not so much. I do NOT feel it in steering wheel at all.

I have been underneath with flashlight...nothing loose that I can tell....I did find the overflowing front diff oil on the vent tube due to this noise...probably not related.

it sounds like a mudflap flapping in the wind and hitting my floorboards....it gets louder and feels harder at higher speeds but is still intermittent and does not have any rhythm to it...it is not speed related, meaning it doesn't get faster at speed or anything...

I noticed my fender liners are very loose..could the wind be getting under them due to the lift? Why didn't I notice it before if this is the case...my front fenders rattle too....is that it?


I have latched the seatbelts in the back in the last 12 hours...have not driven it since...will be trying that today....because those suckers really get moving in the wind at 75 mph.

My concern I suppose is that it is suspension or driveline related and it is going to let loose and leave me stranded..any thoughts or experiences with this would be appreciated..

Thanks in advance!

__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-15-2013, 07:42 PM   #2
Jeeper
 
BadOleRoss's Avatar
 
Join Date: Jul 2011
Location: Lynchburg VA
Posts: 898
Does this happen with the windows up? If not, it might be the drivers seatbelt where it comes out the the retractor mechanism at the floor and passes through the connector that is behind your left shoulder.....that portion of the seatbelt between those 2 points will flap in the wind from time to time.

__________________
2013 JKU True Blue, 4" Zone Lift, 35x12.5x17 Nitto Trail Grapplers, ION 171 Black and Machined Wheels
BadOleRoss is offline   Quote Quick Reply
Old 05-15-2013, 07:58 PM   #3
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
Already ruled out seatbelt. It is freaking me out. Had a guy at the local shop check everything all was tight. He also secured the fender liners

I'm starting to worry
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-15-2013, 08:04 PM   #4
Jeeper
 
Join Date: Dec 2012
Location: Bakersfield, CA
Posts: 96
U joint on the driveshaft? Just wondering with 3.5" of lift.
ccoston is offline   Quote Quick Reply
Old 05-15-2013, 08:09 PM   #5
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
Sounds like you have a Prius stuck in your tire... Or the wind is coming up under Jeep since the lift!
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-15-2013, 08:43 PM   #6
Jeeper
 
ilikeguns's Avatar
 
Join Date: Apr 2012
Location: Long Island, NY
Posts: 732
i get a slight bump under my feet from my loose fender flares.. I trimmed mine and they are partially held in by zip ties so i can live with it.
ilikeguns is offline   Quote Quick Reply
Old 05-15-2013, 09:34 PM   #7
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
Doors back on today and the thump is still there but less noticeable. I feel and hear all kinds of crap because I'm a worrywart....but this has me baffled. Could it be the driveline already? I'm expecting to replace it someday just thought it would last longer.

As for the lift....I never drove my jeep WITHOUT a lift so I have nothing to compare it to.

I have also realized I started noticing the noise/feeling since hard top removal and soft top install and it got worse with door removal and less noticeable with doors going back on. Hmm

Today at 75 mph I hit some dips on the hwy and it felt/sounded like the undercarriage was falling off.


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-15-2013, 09:45 PM   #8
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
Quote:
Originally Posted by carguyco View Post
Doors back on today and the thump is still there but less noticeable. I feel and hear all kinds of crap because I'm a worrywart....but this has me baffled. Could it be the driveline already? I'm expecting to replace it someday just thought it would last longer.

As for the lift....I never drove my jeep WITHOUT a lift so I have nothing to compare it to.

I have also realized I started noticing the noise/feeling since hard top removal and soft top install and it got worse with door removal and less noticeable with doors going back on. Hmm

Today at 75 mph I hit some dips on the hwy and it felt/sounded like the undercarriage was falling off.


Sent from my iPad using Tapatalk
Tony. I would have someone drive your Jeep...Don't tell them why, just have them drive it. See if they notice it. Right now you are so focused on it you are probably "hyper-sensitive" to everything.
Short of putting hard top back on and the doors and sorta running an experiment to see if you notice it. It may have been there the whole time but the doors and hard top muffled the natural sounds. Let me know if you need a hand...
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-15-2013, 09:51 PM   #9
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
I had the shop foreman at Predator drive it....he felt it but not at hwy speeds.
I am hyper sensitive for sure. But I'm not imagining it so not sure what to do next.


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-15-2013, 10:01 PM   #10
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
My guess is at highway speeds the air pressure is at a "constant high" pushing whatever is moving against something solid. But when you're in city driving the pressure increases and decreases with with your speed and whatever is moving...moves more and then you feel it more...
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-15-2013, 10:05 PM   #11
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
I wish I could ride UNDER the jeep at hwy speeds. If it was front driveshaft I think it would be constant and vary with speed yes?


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-15-2013, 10:13 PM   #12
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
You could always PULL the front drive shaft, see if that makes a difference. I'd start with the simple, first. Fenders, control arms are tight, Lug nuts etc...
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-15-2013, 10:43 PM   #13
Jeeper
 
7ekken's Avatar
 
Join Date: Feb 2012
Location: South Carolina
Posts: 184
fender / wheel well liner slapping the inner metal ?
__________________
2013 JKU Sport Gecko 3.73Auto, Premium Soft Top, Rubi Rails, Ace Rails
7ekken is offline   Quote Quick Reply
Old 05-15-2013, 10:48 PM   #14
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
Fender liners were secured today.


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-15-2013, 10:57 PM   #15
Jeeper
 
bengen1's Avatar
 
Join Date: Sep 2011
Location: St. Louis County
Posts: 589
Sway bar end links? Did you disconnect and forgot to reconnect? or they could just be bad
bengen1 is offline   Quote Quick Reply
Old 05-15-2013, 11:07 PM   #16
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
All bolts and nuts were checked today as well as bushings by myself and the shop foreman at a local jeep shop. It is a mystery and google is giving me a headache


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-16-2013, 12:46 AM   #17
Jeeper
 
Lusus_Naturae's Avatar
 
Join Date: Oct 2012
Location: OKC, missing WI
Posts: 2,055
Can you borrow a GoPro from someone and video it from underneath as you drive? I know there are a few people on Youtube that have done that before.
__________________
2013 JKU Sport, billet, auto, 3.73, LSD, 315/75/16 Duratracs on MB 72, 10A springs, Bushwacker flatties

Sold - 2005 TJ, red, auto, 3.73, 33" Duratracs, 4" lift
Ice storm casualty in 2007 - 2003 TJ, green, auto, 3.73, 33" Duratracs, 4" lift
Lusus_Naturae is offline   Quote Quick Reply
Old 05-16-2013, 12:59 AM   #18
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
I now have a valid reason to buy a go pro. Awesome idea!


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-16-2013, 05:36 AM   #19
MallCrawler

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 34,316
Quote:
Originally Posted by carguyco View Post
I now have a valid reason to buy a go pro. Awesome idea!

Sent from my iPad using Tapatalk
X2

I need to do this myself. I was able to tape my iphone to a CA to grab a DS view. Worked but phone kept shutting off
__________________
2007 Rubicon/Rock Krawler triple rate 2.5" coils/RK rear TB w/ a teraflex raised bracket/Rancho 9000 31/32XL shocks/Synergy flipped draglink,ball joints,tie rod /Hankook MT 315-75-16 on Level 8 ZX's/Rancho geo brackets/Ruff stuff uppers/Fox ATS stabilizer/Adams front DS/Artec front armor w/ Currie upper bushings/Rancho cat back exhaust.

Lifting your JK? Read this!!



Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote Quick Reply
Old 05-16-2013, 08:41 AM   #20
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
Tony, I have a camera we could mount up and see if something is or where it is moving. I work just down the street from you...
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-16-2013, 09:19 AM   #21
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
John I may take you up on that sometime very soon. I have your number. Thanks


Sent from my iPad using Tapatalk
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-17-2013, 11:52 AM   #22
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
After googleing and Binging my ass off the last few days I found this:

My last test run (yup, my last one because I figured out what it was) was at about 9PM last night and it was pretty windy. However, i figured if i waited until later at night I would have a better chance of listening and it not being drowned out by all the other road noise. Well, immediately when I hit about 65 it started again. But, this time it was pretty apparent where it was coming from. It turns out the latch able (header) front side portion of my Trektop NX was getting lifted and slammed down onto the roll bar/speaker bar. I heard it pretty clearly and felt the thump underneath my seat at the same time. I pulled over, latched the top and hit the road again. No thump. Unbelievable. I couldn't help but laugh as I felt like a total dipshit.

Decided to take the top off and see what happened....took the ENTIRE Trektop off the jeep and drove on the highway....sound gone. I'm 90% sure that was it....are you effing kidding me? I felt it in the roll bar last night on the way home from work and it was loud...so I tried this and I think it worked...I will keep this thread up to date...I just put the top back on to drive to work this afternoon so I should know soon enough...thanks for all the help!
__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Old 05-17-2013, 12:32 PM   #23
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
LOL, Got a love it when it turns out be something simple But your brain had you convinced your JEEP was falling apart.
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-17-2013, 08:16 PM   #24
Moderator

WF Supporting Member
::WF Moderator::
 
Sinister6's Avatar
 
Join Date: Jan 2013
Location: Colorado Springs
Posts: 4,504
How'd it drive home, Tony?
__________________
The Wolf is not concerned with the opinion of sheep.

MY BUILD: :
http://www.wranglerforum.com/f322/si...ad-235526.html
Sinister6 is offline   Quote Quick Reply
Old 05-18-2013, 12:22 AM   #25
Jeeper
 
carguyco's Avatar
 
Join Date: May 2012
Location: Colorado Springs, CO
Posts: 374
I had such a bad day I didn't even think about the jeep honestly. Except to savor the doors off top down feeling only a jeep can deliver.
The sound is there with top on and gone with top off. I'm gonna stop worrying!

Hope this thread helps others

Thanks John!


Sent from my iPad using Tapatalk

__________________
2013 JKU Rubicon TRUE BLUE 6 Speed
3.5" AEV SC lift....315/70/17 ProComp Xtreme Mud Terrain Tires....Black Savegre Wheels
carguyco is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 04:45 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC