35" Tires on a 4" lift and getting shaking - JKowners.com : Jeep Wrangler JK Forum
LinkBack Thread Tools Display Modes
post #1 of 7 Old 12-15-2009, 06:01 PM Thread Starter
Join Date: Dec 2009
Posts: 2
Feedback: 0 reviews
Question 35" Tires on a 4" lift and getting shaking

I am new to this, so forgive me if this has been posted a 100 times.

I have 4door jk and have installed a 4" rancho suspension lift and 35" bfg mud terrain tires. When accelerating through or maintaining a speed between 35mph and 45mph my front end shakes. once i pass the 45 mph it goes away. I have had the tire reballanced with little improvement.

I have not replaced the steering dampener at this point. Also, how should the front end be aligned? to the stock specs or different specs for the larger tires?

thanks for the help.
mdean4x4 is offline  
Sponsored Links
post #2 of 7 Old 12-15-2009, 06:30 PM
Rock God
Born2run's Avatar
Join Date: Sep 2008
Posts: 1,905
Feedback: 0 reviews

Check all that you installed and make sure it is all tight....Then go get it aligned by someone who does 4wd.

"All wranglers are jeeps, not all jeeps are wranglers"

"Holding out for the Pentastar in 2012"
Born2run is offline  
post #3 of 7 Old 12-15-2009, 06:53 PM
JKO Addict!
Join Date: Jul 2009
Posts: 3,866
Feedback: 3 reviews

make sure your track bar is torqued to 125 ft lbs
BBirish is offline  
Sponsored Links
post #4 of 7 Old 12-15-2009, 09:06 PM
Granite Guru
RIDERED67's Avatar
Join Date: Mar 2009
Location: DELCO PA(South Philly)
Posts: 272
Feedback: 0 reviews

If your Jeep did not shake with the old tires and you didnt hit anything since the installation of the new tires then your allignment is most likely fine. You need to get your tires balanced correctly by a shop that has experience with big tires. Find a shop that has a "Road Force Balancer" machine. It's more expensive but it will get rid of your shakes! If you cant find the road force machine then go to a shop that balances big rig tires and see what they can do for you. My MTR Kevlars were shaking the same as yours even after I had them balanced by 3 different shops. 1 road force balance and no more shakes!

I will never forget that I am an American, fighting for freedom, responsible for my actions, and dedicated to the principles which made this country free
RIDERED67 is offline  
post #5 of 7 Old 12-15-2009, 09:21 PM
Granite Guru
AnkurGT's Avatar
Join Date: Sep 2009
Location: Marietta, GA
Age: 39
Posts: 151
Feedback: 0 reviews
Send a message via AIM to AnkurGT Send a message via Yahoo to AnkurGT

Originally Posted by RIDERED67 View Post
You need to get your tires balanced correctly by a shop that has experience with big tires.
x2 - I have the Rancho 4" Sport Lift and running 37" KM2s and no shakes at all... balancing and alignment by 4x4 people is the key...

The Ramblin' Rubinator:
2009 Stone White Rubicon Unlimited
Rugged Ridge XHD Front Bumper w/ MileMarker 9500SEC Winch - Rancho Rear Bumper/Carrier - Rancho 4" Sport Lift - 37x12.50x17 BFG KM2s on 17" M/T Sidebiters - AirRaid Cold Air Intake and Throttle Body Spacer - Rugged Ridge Side Armor and Euroguards - IPF XSD900 Lights - Rancho Crawler Cat-back Exhaust - Poly Performance Gussets and Sleeves - ARB Competition Diff Covers

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

AnkurGT is offline  
post #6 of 7 Old 12-16-2009, 10:59 AM
JKowners Vendor
WeBeRockin's Avatar
Join Date: Dec 2009
Location: Northwest Arkansas
Age: 60
Posts: 194
Feedback: 1 reviews
Same problem, the JK Death Wobble

I installed a 4 inch skyjacker lift early in the summer but kept stock wheels and 265/70 R17 BFG AT's. Had no issues (other than rear track bar bracket breaking)
Anyway, Friday I installed XD series 795 Boss wheels wearing 315/70 R17 BFG AT and on my first test run, hit a small bump with right front and wobble almost yanked the wheel out of my hands.
Since then I've played with air pressure, rotated tires all around, and checked for defective tire/wheel issues, all to no avail, though issue is somewhat minimized at lower tire pressure.
Reading through the forums last night, it appears the "Death Wobble" is a relatively common occurence when upgrading tire size on a solid axle vehicle. Sometimes solvable by balance, stabilizers, adjustments to track bar, camber, alignment, ball joints; and sometimes not, leading some owners to go all the way back to stock to eliminate the issue.
I'm going in to get Road Force Balanced again, and to check alignment. Then start spending money.
Good luck. I'll update if I have any.
WeBeRockin is offline  
post #7 of 7 Old 12-16-2009, 11:07 AM
Rock God
The Clam's Avatar
Join Date: Aug 2009
Location: Denver, CO
Age: 41
Posts: 1,830
Feedback: 8 reviews

The one thing I learned with my brief bout with it is make sure that your trackbars and control arms are loosened and then re-tourqued to 125lbs while sitting with the weight on all four tires.

I originally had torqued my trackbar while it was still in the air, and had not loosend up my control arms when I lifted it (granted I did only 2.5" BB, no change in tires, and I still have stock arms and you most likely do not).

The other thing I learned is that there are lots of good smart folks here that will help you diagnose and remedy it!

~ Clam
The Clam is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the JKowners.com : Jeep Wrangler JK 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome