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Old 06-06-2014, 10:22 PM   #1
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45MPH shake

I have a 2006 Jeep Wrangler 4.0 Automatic, Zone 4.25" combo lift. Bfg All Tertain TA 33x15 x12.5 JKS adjustable front track bar, 1" motor mount lift, drive shaft and sye, swaybar disconnects, front track bar, drag link and tire rod were replaced a few months before the lift when driving at about 40 to 45 the grunt end wants to shake. Not a death wobble (yet?) Sometimes it is worse than others And seems to be less if i accelerate harder. I have taken back to where i had the lift installed found nothing loose but front tires were feathered a bit. They rotated to the back and balanced. I then took it to get alignment. It drives much better now, as before it was very darty but the shake is still there. Any help figuring this it would be greatly appreciated

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Old 06-06-2014, 10:35 PM   #2
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Tires need to be perfectly balanced, so I'd start there. Then I'd check the alignment (ballpark first, full dial-in later), steering components, ball joints, unit bearings, rear track bar bushings (ends), and since I was under it I'd check the control arm bushings all around too.

I'd bet you'll find it that way.

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Old 06-06-2014, 10:56 PM   #3
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I had the tires balanced and rotated problem is still there. I also had alignment and it now drives much better but shake is still there. I'll check the bushings and joints tomorrow and see what i can find. I guess i assumed that when i have taken to mechanic and told them what i am dealing with that they would check this thanks for the info
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Old 06-06-2014, 11:02 PM   #4
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Yeah, often times shops will balance the tires sorta close, but they really need to be perfect. 40-50 mph is where the resonant frequencies of most tires come into play and shake if they aren't perfectly balanced. Of course worn and loose parts will compound it. I have chased this stuff down on two jeeps in the last year or so, and I completely eliminated it on both. It can be a pain, but it is solvable.
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Old 06-10-2014, 08:30 PM   #5
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I have checked to the best of my ability (I am pretty mechanically inclined - Just learning Jeep though) that everything seems tight & or not wore out. What's very strange the longer i am trying to trace down the problem is that is does not happen all of the time, so i am wondering if the gravel from my drive that gets stuck in the tread could possibly mess with it? I know i had a small amount of ice freeze on the bottom of the rim this winter and damn what a scare when i started picking up speed. I am also going to have a buddy that owns a balancing machine check the tires on his machine to see what it says.
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Old 06-10-2014, 08:38 PM   #6
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Tire balance. I've needed 3 trips to get my 35's balanced well enough to get rid of a speed sensitive shimmy. Speed sensitive shimmies are rarely anything but an imperfectly balanced tire.
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Old 06-11-2014, 03:24 AM   #7
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My 03 TJ gets the shimmy-shake at around 45 to 50 currently. Some days are worse than others. It comes and goes. Sometimes it doesn't happen for months, and other times it's every day.

It seems to start with hitting a bump or two in the road. But sometimes it happens on glass-smooth surfaces.

Once in a while it degrades into the Death Wobble. Most of the time not.

I've never had a vehicle so sensitive to whatever is causing it.

It seems to be tire related, but they are all balanced and wearing well. It's like a box of chocolates: every time I open the box I never know what I'll get.

The Jeep is an interesting mistress. Sensitive, expensive to dress up with accessories, but a great ride when on the road less traveled.
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Old 06-11-2014, 09:11 AM   #8
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My 05 did the same thing around 50mph , I lowered the air pressure in my 33x12.5x15 tires to 29psi and hasn't done it since. Just a suggestion good luck .
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Old 06-17-2014, 03:56 AM   #9
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I would recommend finding a shop that has a "road force" balancer. Kind of difficult to explain but a tire can be balanced on a machine, but then be a little off when reinstalled and driven. A tire can actually be thicker in the tread on a small section than it is on the rest of the tire, this will cause the problem you describe. A Road Force Balancer will detect this and balance accordingly, a eliminate the problem. And usually cost the same as a regular tire balance.
Call around where you live, try dealerships first as they are most likely to have one. Good luck!
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Old 06-17-2014, 06:39 AM   #10
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I had the 47-53 mph shimmy. Chased it for a couple years, many tire balancing, road force balance, dry steering checks, replace track bar bolt, check for hole wear, etc.
The only thing that fixed my 47-53 mph shimmy was replacing the stock front LCAs with Currie/Johnny Joint front LCAs. Over 2 years in, still the shimmy has not returned.

I can feel when my tires need balanced... it happened recently when I had to re-seal the beads on my fronts and threw off the balance... but it's not the harmonic shimmy in the steering wheel that I've had previously.

I think the stock LCAs are a bigger culprit in the shimmy than people realize.
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Old 06-17-2014, 06:40 AM   #11
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A lot of times bigger tires are extremely hard to balance. I've heard of a technique for balancing the big tires on 18 wheelers by putting plastic beads in the tires. Supposed to be very easy and you will never have to get the tires balanced again. Anyone have experience with these?
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Old 06-17-2014, 08:23 AM   #12
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Whats a good pressure for BFG Mud Terrain T/A KM2 - 33X12.50 on 15" rims?

Quote:
Originally Posted by Jerry Bransford View Post
Tire balance. I've needed 3 trips to get my 35's balanced well enough to get rid of a speed sensitive shimmy. Speed sensitive shimmies are rarely anything but an imperfectly balanced tire.
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Old 06-17-2014, 08:52 AM   #13
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Whats a good pressure for BFG Mud Terrain T/A KM2 - 33X12.50 on 15" rims?
26-28 psi
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Old 06-17-2014, 08:53 AM   #14
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Latest update - Had tires re-balanced and now is worse than before with an added benefit now when hitting brakes at these speeds the front end shakes similar to when my rotors were warped. I am having them checked and or replaced shortly.

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Old 06-17-2014, 09:16 AM   #15
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Set the toe in to 0. I've done this 2x on my current jeep and once on my last jeep to fix a speed related shimmy. It's an easy test, just put a 1/4 turn on the tie rod to extend it a bit. You can mark it and return back to where it was if it doesn't fix it, but I bet it will. I did the same thing with tire balance and even bought centramatic balancers, but the toe in was the issue.
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Old 06-17-2014, 10:29 AM   #16
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Originally Posted by Stubbs60 View Post
A lot of times bigger tires are extremely hard to balance. I've heard of a technique for balancing the big tires on 18 wheelers by putting plastic beads in the tires. Supposed to be very easy and you will never have to get the tires balanced again. Anyone have experience with these?
I've also wondered about these.... used on large RV's also.
Would be great and simple if these would work on the large offroad tires.


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Old 06-17-2014, 10:57 AM   #17
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Guys with cruiser motorcycle tires and truckers seem to love them. Folks with Jeeps seem to hate them and take them out to get a perfect dynamic balance done. That's what I've seen happen through research in the internet anyhow. Luckily I have a tire shop that will tirelessly and endlessly dismount, rotate, flip, remount, and perfectly balance my wheels/tires until I'm happy.

Thank you Americas tire (or discount tire out east)!
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Old 06-17-2014, 01:45 PM   #18
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Quote:
Originally Posted by Jerry Bransford View Post
Tire balance. I've needed 3 trips to get my 35's balanced well enough to get rid of a speed sensitive shimmy. Speed sensitive shimmies are rarely anything but an imperfectly balanced tire.
My driveshaft is currently causing my vibration. Worn out CV ball. I chased it down for months thinking it was a tire, wheel, track bar, ball joint, but turns out its the rear DS. 50+mph
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Old 06-17-2014, 02:50 PM   #19
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You should also check the tire for a bulge in the tire. You might have broken belts in the tire, very dangerous. The tires being balanced would still not fix this problem. Has anybody tried the goodyear wrangler tires, with kevlar bands. I was going to give them a whirl. If you over inflate the bands are most likely to start coming out the outside of the tire. If you "under" inflate, and climb over rocks, they are most likely to start coming out on the inside of the tire.
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Old 06-18-2014, 09:55 AM   #20
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Has anybody tried the goodyear wrangler tires, with kevlar bands. I was going to give them a whirl. If you over inflate the bands are most likely to start coming out the outside of the tire. If you "under" inflate, and climb over rocks, they are most likely to start coming out on the inside of the tire.
Goodyear MTR tires with Kevlar is what I and many on this forum run. There is no problem with airing them down and they are great in the rocks. I run my 33's at 8 psi when wheeling. They are designed to take it. They are also a well mannered tire on the highway.
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Old 06-20-2014, 08:54 PM   #21
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Tires Re-balanced again - seems to be much better but have not really had a chance to drive it much. I do have another questions i was sitting in the driveway cranking the steering wheel back and forth and noticed what seems like a bit of movement on the rear tires kind of like a very minute bit of articulation (not really a good way to describe it) is that normal?

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