35" Tires on a 4" lift and getting shaking - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 12-15-2009, 06:01 PM Thread Starter
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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.
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post #2 of 7 Old 12-15-2009, 06:30 PM
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Check all that you installed and make sure it is all tight....Then go get it aligned by someone who does 4wd.

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post #3 of 7 Old 12-15-2009, 06:53 PM
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make sure your track bar is torqued to 125 ft lbs
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post #4 of 7 Old 12-15-2009, 09:06 PM
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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!

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post #5 of 7 Old 12-15-2009, 09:21 PM
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Quote:
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...

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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

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post #6 of 7 Old 12-16-2009, 10:59 AM
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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.
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post #7 of 7 Old 12-16-2009, 11:07 AM
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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!

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