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Old 12-28-2011, 07:59 AM   #1
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Jeep rides like crap after levelling kit installed

Need to see if anyone else has experienced something like this. I have installed a Teraflex 1.5" levelling kit, Rockstar rims and BFG All-Terrain TA KO 305/65R18 tires. Now when driving on city streets the ride is so bouncy that people in the back seat are swaying back and forth and bouncing around as if I was off-roading. I find that the slightest bump causes the Jeep to sway back and forth rather than just bounce up and down. Is this normal or is something seriously out of whack?

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Old 12-28-2011, 08:01 AM   #2
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Did you change shocks? Did you re-attach everything correctly?

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Old 12-28-2011, 08:03 AM   #3
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Alignment.
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Old 12-28-2011, 08:08 AM   #4
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Better revisit that suspension. After install of the same kit on mine, the ride was just like stock.
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Old 12-28-2011, 08:45 AM   #5
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What tire pressure are you running? Bouncey usually means high tire pressure. Most tire places fill the tires to 35-40 PSI.
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Old 12-28-2011, 08:53 AM   #6
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What tire pressure are you running? Bouncey usually means high tire pressure. Most tire places fill the tires to 35-40 PSI.
Bingo. That is what I was thinking. Check it and back it down some if it is high. 28-30 should be much better...

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Old 12-28-2011, 09:34 AM   #7
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Did you do the instal? A tip I recently learned is you need to loosen the trac bar bolts, LCA bolts, and swaybar disconnect link bolts prior to installing any lift. Do not re tighten until your rig is on the floor and you have literally shaken the hell out of it. Not doing so will cause binding in your bushings as the geometry is now changed, regardless of how high you went.
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Old 12-28-2011, 09:36 AM   #8
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Is it a jarring bump or smooth? Could be tire pressure but could also be shocks not correctly installed. Also, maybe cause of the 18" rims?
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Old 12-28-2011, 09:37 AM   #9
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Tire pressure is certainly key. I also had a jeep that had loose shock bolts once. That thing bounced like tigger! Check to make sure the shocks have been tightened.
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Old 12-28-2011, 09:46 AM   #10
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Originally Posted by adrenalin View Post
... Now when driving on city streets the ride is so bouncy that people in the back seat are swaying back and forth and bouncing around as if I was off-roading. I find that the slightest bump causes the Jeep to sway back and forth rather than just bounce up and down. ...
That actually sounds kind of fun! Maybe you should leave it that way? Do you have young boys? My five-year-old son would love all that.
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Old 12-28-2011, 10:44 AM   #11
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Originally Posted by gluestick View Post
Did you do the instal? A tip I recently learned is you need to loosen the trac bar bolts, LCA bolts, and swaybar disconnect link bolts prior to installing any lift. Do not re tighten until your rig is on the floor and you have literally shaken the hell out of it. Not doing so will cause binding in your bushings as the geometry is now changed, regardless of how high you went.
That might be the problem. I did the install myself based on the instructions that came with the kit. While the jeep was still in the air I tightened and torqued all of the bolts.

I am only running 32 psi in the tires. There really isn't any jarring, just seems very sloppy and all over the place. Factory shocks are still installed.
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Old 12-28-2011, 10:59 AM   #12
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I just made an appointment to get an alignment done on Friday. Hopefully that will fix the issue.
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Old 12-28-2011, 11:01 AM   #13
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Originally Posted by gluestick View Post
Did you do the instal? A tip I recently learned is you need to loosen the trac bar bolts, LCA bolts, and swaybar disconnect link bolts prior to installing any lift. Do not re tighten until your rig is on the floor and you have literally shaken the hell out of it. Not doing so will cause binding in your bushings as the geometry is now changed, regardless of how high you went.
Quote:
Originally Posted by adrenalin View Post
That might be the problem. I did the install myself based on the instructions that came with the kit. While the jeep was still in the air I tightened and torqued all of the bolts.

I am only running 32 psi in the tires. There really isn't any jarring, just seems very sloppy and all over the place. Factory shocks are still installed.
The binding that Gluestick speaks of is actually a great recipe for causing Death Wobble (the real version) in the future. Follow his instructions to avoid it.

And check your PSI, as others have said.
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Old 12-28-2011, 11:04 AM   #14
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Actually the BFG All-Terrain TA KO 305/65R18 should be at 35 psi. 29-30psi is too low for that class of tire. But some tire place will still over inflate a E class tire for a heavier vehicle. I have seen some inflate them to 50-60psi. Make sure it has a PSI of 35.
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Old 12-28-2011, 11:09 AM   #15
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I just made an appointment to get an alignment done on Friday. Hopefully that will fix the issue.
Alignment would cause a pull on the steering but doubt it would cause what you are listing. 32psi in the tires wouldn't cause this either. I would recheck every bolt that was taken loose during installation to make sure everything is still tight. It seems more of a problem in the swaybar, trackbar, control arm, or some other suspension type area.
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Old 12-28-2011, 12:21 PM   #16
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Stupid question but while the Jeep is on the ground can I just loosen the bolts (same ones removed during install), shake the jeep and then tighten the bolts (proper torque) all over again? I just don't have access to the lift this week.
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Old 12-28-2011, 12:57 PM   #17
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You could, but I couldn't expect it would release all the binding points. Taking the weight and load off the components by putting it on jack stands, loosening, lowering, then tighetening would most certainly be the correct answer. Use obvious caution and common sense though- do not get under a vehicle supported solely by a jack, always use a lift or jack stands. It's a good excuse to pick up a pair, if you don't already own them.
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Old 12-28-2011, 02:39 PM   #18
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Thanks for all the advice. I took a better look at everything. The tires were recently installed and the 32 psi is what the installer put them at. I looked at the sidewall and see that the psi rating is 65 (cold). That being said I inflated the to 50 psi and took it out for a spin. I'd say the issue is pretty much gone. It certainly handles better and is not bouncing all over the place. I know a lot of people say you should inflate it to what the vehicle sticker shows but I'm pretty sure that only applies to the stock tire size that comes with the vehicle. Correct?
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Old 12-28-2011, 02:46 PM   #19
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when installing any sort of lift you are supposed to set the weight of the vehicle down before torquing everything. Loosening, setting it down then locking everything tight might solve your issues. And... I would do it before the allignment. I also run my 33" 15's at 30 psi with the lower weight of the Jeep. You'll have to play with the pressure, 5 pounds makes a hell of a difference imo.
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Old 12-28-2011, 02:59 PM   #20
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Quote:
Originally Posted by adrenalin
Thanks for all the advice. I took a better look at everything. The tires were recently installed and the 32 psi is what the installer put them at. I looked at the sidewall and see that the psi rating is 65 (cold). That being said I inflated the to 50 psi and took it out for a spin. I'd say the issue is pretty much gone. It certainly handles better and is not bouncing all over the place. I know a lot of people say you should inflate it to what the vehicle sticker shows but I'm pretty sure that only applies to the stock tire size that comes with the vehicle. Correct?
Correct the number on the door is for stock tires. And I'm pretty sure the number on the tire is MAX pressure, you shouldn't use that for your target pressure.
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Old 12-28-2011, 03:03 PM   #21
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Correct the number on the door is for stock tires. And I'm pretty sure the number on the tire is MAX pressure, you shouldn't use that for your target pressure.
I usually shoot for around 80% of the MAX psi rating on the tire which is why I decided to inflate these up to 50 psi. I just hope the factory TPMS can handle it.
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Old 12-28-2011, 03:07 PM   #22
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50 PSI is way too high, IMO. I've got 315/75R16 DT's and I'm running 30 in them right now.
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Old 12-28-2011, 03:23 PM   #23
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when installing any sort of lift you are supposed to set the weight of the vehicle down before torquing everything. Loosening, setting it down then locking everything tight might solve your issues. And... I would do it before the allignment. I also run my 33" 15's at 30 psi with the lower weight of the Jeep. You'll have to play with the pressure, 5 pounds makes a hell of a difference imo.

You MUST do this...
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Old 12-28-2011, 03:57 PM   #24
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You MUST do this...
Ok. I'll do this on the weekend and then update the thread with the results.
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Old 12-28-2011, 03:59 PM   #25
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Old 12-28-2011, 04:00 PM   #26
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Old 12-28-2011, 04:10 PM   #27
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Beat me to it.
Maybe we need a new sticky with these links and a few others titled:

"If you are planning to lift, read this first"
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Old 12-28-2011, 06:56 PM   #28
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50 PSI is way too high, IMO. I've got 315/75R16 DT's and I'm running 30 in them right now.
You can check for P255/70R18: comes out at 2469 lbs @35 PSI ( the recommended pressure for stock rubber)*. Check out the table for an equivalent load with the new size. Works for me.

305/65R18, somewhere between 35-40 according to this table. Agree that 315/75R16 @ 30 would be about right.



http://toyotires.com/tire-care-safet...flation-tables

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Old 12-28-2011, 07:37 PM   #29
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Is it a jarring bump or smooth? Could be tire pressure but could also be shocks not correctly installed. Also, maybe cause of the 18" rims?
Why would 18" wheels cause this?
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Old 12-28-2011, 07:38 PM   #30
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Check to be sure that the lower ends of your springs are properly seated on the mounting plate on top of your front differential. There's a specific groove that the lower end of the spring has to be seated into. I'm not sure of the consequence of it being out of place, but it seems as if you've checked and rechecked the obvious. I point this out because I changed my front spacers 2 months ago to adjust for a heavy winch and if I hadn't had done a double check of everything before we lowered the rig, my drivers side spring would have been out of the pocket. I think it happened as we were pushing and manipulating the axle to fit the larger spacer on the passenger side. Might be worth putting an eyeball on it.

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