back of Wrangler bouncing - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ 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 02-28-2012, 02:04 PM   #1
Newb
 
Join Date: Feb 2012
Posts: 7
back of Wrangler bouncing

I just bought 1999 wrangler and I replaced the old shocks and put new tires on it but it still seems to bounce in the rear when going over bumps what problem could this be or is it just part of owning a jeep? This is my first Jeep I have ever owned so its all new to me. Any advice?

razrback is offline   Quote Quick Reply
Old 02-28-2012, 02:36 PM   #2
Jeeper
 
C.L.'s Avatar
 
Join Date: Mar 2011
Location: North NJ
Posts: 1,990
They are a bit light in the rear.

-Do you have a hard top or soft top?
-Is the Jeep lifted?
-What type of shocks did you put in?
-What size tires are you running, and what pressure are you running?

Jeeps are light. Some common mistakes are running too much air in the tires (go by the door jam sticker for stock tires, NOT the tire sidewall. Ask around the forum for larger tires), and using too stiff of shocks/springs for a lift.

Air pressure is the big one. The sidewalls list the MAX load pressure, not the best operating pressure for any given vehicle. I think the sidewalls of my 35x12.50x15's say 35psi, but if i run them over 25psi they feel like wagon wheels.

C.L. is offline   Quote Quick Reply
Old 02-28-2012, 04:59 PM   #3
Jeeper

WF Supporting Member
 
yoopone's Avatar
 
Join Date: Dec 2010
Location: Suburban Chicago and the UP of Michigan
Posts: 596
Quote:
Originally Posted by razrback View Post
I just bought 1999 wrangler and I replaced the old shocks and put new tires on it but it still seems to bounce in the rear when going over bumps what problem could this be or is it just part of owning a jeep? This is my first Jeep I have ever owned so its all new to me. Any advice?
Do you mean that the body bounces when hitting a bump? Maybe feels like it is softer on one side?
__________________
1989 YJ
1997 TJ
1999 TJ
2006 TJ
2005 TJ Rubicon
yoopone is offline   Quote Quick Reply
Old 02-29-2012, 04:09 PM   #4
Newb
 
Join Date: Feb 2012
Posts: 7
I have a hard top Its not lifted I put monroe shocks onit my tires are 31x10.5 R15 I dont have a gauge with me to check the psi but ill check it when I get home. I havent checked since I had the new tires installed a week ago.


Quote:
Originally Posted by C.L. View Post
They are a bit light in the rear.

-Do you have a hard top or soft top?
-Is the Jeep lifted?
-What type of shocks did you put in?
-What size tires are you running, and what pressure are you running?

Jeeps are light. Some common mistakes are running too much air in the tires (go by the door jam sticker for stock tires, NOT the tire sidewall. Ask around the forum for larger tires), and using too stiff of shocks/springs for a lift.

Air pressure is the big one. The sidewalls list the MAX load pressure, not the best operating pressure for any given vehicle. I think the sidewalls of my 35x12.50x15's say 35psi, but if i run them over 25psi they feel like wagon wheels.
razrback is offline   Quote Quick Reply
Old 02-29-2012, 04:12 PM   #5
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,208
Images: 2
Quote:
Originally Posted by razrback View Post
I dont have a gauge with me to check the psi but ill check it when I get home. I havent checked since I had the new tires installed a week ago.
My bet is the tire shop over-filled them to some crazy high PSI. For your 31" tires, they should be filled to 29-31 psi at the most.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 02-29-2012, 07:44 PM   #6
Jeeper
 
Join Date: Feb 2012
Location: Waukesha, WI
Posts: 31
Its not unusual... when I go over a bump in my jeep.. my girlfriend who sat in the back told me she felt like the rear end was kicking out from under her... it I think has to do with the coil springs in the back... and the shocks too.. if you went with an OEM shock their not as stiff so they'll bounce more... hence when i grab my jeep at the top currently for whatever reason it moves around like a rag doll... (the guy put OEM shocks on the back.. he felt that was the best idea for a Off roading jeep... *roll eyes*) your tires could be over filled too.. but I think its just the coils... you'll get use to it after a while.. just dont ram them speed bumps! lol

P.s. Ive also felt the difference between a Leaf Spring set up and a coil now... so theres more.. flexing and movement... correct me if Im wrong :P
Cowboy6686 is offline   Quote Quick Reply
Old 02-29-2012, 07:47 PM   #7
Jeeper
 
C.L.'s Avatar
 
Join Date: Mar 2011
Location: North NJ
Posts: 1,990
Quote:
Originally Posted by razrback View Post
I havent checked since I had the new tires installed a week ago.
Bingo! Those guys almost always fill to the sidewall pressure, which is way too high for your Jeep. I wouldn't be surprised if he had 40psi in there.
C.L. is offline   Quote Quick Reply
Old 03-01-2012, 07:25 AM   #8
Newb
 
Join Date: Feb 2012
Posts: 7
You guys were right the max psi on the tires say 50psi and every tire had different pressure. from 45psi to 41psi
razrback is offline   Quote Quick Reply
Old 03-02-2012, 10:06 AM   #9
Jeeper
 
Join Date: Feb 2012
Location: Waukesha, WI
Posts: 31
eww yeah.. that doesnt work out to well Max PSI will make you float too.. I went by the fact ya did the shocks.. meh.. lol forgot about the tires... but hey! you got it figured out! Nice

Cowboy6686 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
1997 wrangler ,need help please!!! Q8ypilot TJ General Discussion Forum 4 02-29-2012 10:36 AM
A Nook in your dash? Interesting Wrangler hack. Renaissance_Redneck General Jeep Discussion 7 02-29-2012 10:34 AM
Possible Future Wrangler Owner Dose11 WF New Member Check In 7 02-29-2012 04:31 AM
2007 Wrangler Bow Kit JGoeps JK General Discussion Forum 1 02-28-2012 04:46 PM
NEED 2003 Wrangler X engine jaunvaldez YJ General Discussion Forum 1 02-28-2012 06:34 AM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 11:19 PM.



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