Shimmy between 46-52mph - JeepForum.com
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post #1 of 6 Old 08-21-2017, 05:22 PM Thread Starter
bjh0616
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Shimmy between 46-52mph

I have this shimmy that physically moves the steering wheel in my hand only between 46-52mph. When Im accelerating it is worse, but I can even feel it when completely off the throttle and brakes coming to a stop through this speed range. It is not as bad as death wobble, but I am afraid of hitting any bumps during this speed that might push it to start death wobble. So far I have replaced the drag link assembly, installed KOR super hard bushings in my JKS adj trackbar and just had the front tires road force balanced. I still feel like it has to be a tire issue, when they gave it back to me after road force balancing I noticed it had a good deal of weights on the inside and outside of the wheels, much more than when I brought it to them. I asked the shop to check the ball joints when they had the wheels off and they said it looked good. Any other suggestions?

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post #2 of 6 Old 08-21-2017, 07:43 PM
skipperau
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Wheel bearings are a possible candidate here, I personally think you're on the right track thinking it's tyre related, but seeing you've just had them rebalanced I'd look at the wheel bearings. Tie rod ends too.
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post #3 of 6 Old 08-21-2017, 08:38 PM
gsxr800
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Quote:
Originally Posted by bjh0616 View Post
I have this shimmy that physically moves the steering wheel in my hand only between 46-52mph. When Im accelerating it is worse, but I can even feel it when completely off the throttle and brakes coming to a stop through this speed range. It is not as bad as death wobble, but I am afraid of hitting any bumps during this speed that might push it to start death wobble. So far I have replaced the drag link assembly, installed KOR super hard bushings in my JKS adj trackbar and just had the front tires road force balanced. I still feel like it has to be a tire issue, when they gave it back to me after road force balancing I noticed it had a good deal of weights on the inside and outside of the wheels, much more than when I brought it to them. I asked the shop to check the ball joints when they had the wheels off and they said it looked good. Any other suggestions?


I have that shimmy between 42-47 mph. Not there before. Not there after. It's so precise it's amazing.

02 Grand Cherokee 4.0 w/IRO 3" lift, Procomp ES9000, Adj track bar, 17" JK Moab w/GY Wrangler STR
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post #4 of 6 Old 08-21-2017, 09:07 PM Thread Starter
bjh0616
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Yes, mine is definitely very precise in this speed range. What's highly annoying about it is my commute to work is mainly a 45mph zone with heavy traffic so I spend 90% of my drive time in this speed range.
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post #5 of 6 Old 08-23-2017, 10:31 AM Thread Starter
bjh0616
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Before I took it to have the tires re balanced I had the air pressure at 32 psi, I noticed that they had them all at 39 psi after I got it back. I have 265 70 18 General grabber at2's, I am going to lower it back down to 30-32 psi and see if that makes a difference. What is the correct pressure it should be?
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post #6 of 6 Old 08-23-2017, 10:36 AM
skipperau
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Quote:
Originally Posted by bjh0616 View Post
Before I took it to have the tires re balanced I had the air pressure at 32 psi, I noticed that they had them all at 39 psi after I got it back. I have 265 70 18 General grabber at2's, I am going to lower it back down to 30-32 psi and see if that makes a difference. What is the correct pressure it should be?


Look at the tyres load information on the sidewall. I run mine at around 75% of max pressure. In the case of my Falkens, max load rating is at 51psi, I run them at 46 and they are great, if I run them at the placard pressure they squirm and handle poorly.
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