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I have a 2009 Ram 1500 Quad-cab 4x4 Hemi. Truck drives very smooth until 60 MPH where it develops a vibration or shimmy. Had the wheels balanced, tech noticed serious cupping on both of the front tires (not on the rears). Rotated the tires so that the cupped ones are now on the rear. Still notice the vibration, just not as bad.

It seems to me that cupped tires would or could make the truck vibrate... but wouldn't it be a constant vibration instead of smooth up to 60 MPH?

Also, I'm fairly certain that one or both front rotors are warped; I feel the pedal pulsing during moderately hard braking, and I can hear the runout of the rotor against the pads when I make a low-speed sharp turn (whup-whup-whup-whup..). Would warped rotors contribute at all to my 60 MPH vibration when NOT braking?

One more question.. what is the average life of the various front end components? Specifically shocks, tie rods, sway bar links, dampers, etc..

David Reed
 

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2008 RAM 1500 ST 3.7L Magnum V6 PS2
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Welcome to the forum David, since I see you're new here! You have some good questions and while I don't have the answer, plenty of knowledgeable folks on here who can help, so stick around, someone should be along shortly! I do know that when riding with my dad when his rotors and tires were toast, lol, yes, you do feel a very definite vibration at highway speeds, and I was in the passenger seat next to him and that was exactly what I told him, he needed that fixed before driving all the way back to S. FL from out here, but good luck with that! In the meantime, be sure to introduce yourself to everyone in the Newbie Checkin and get your official Ram Z welcome! :)

- Cajun
 

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Just had my 2004 Ram front bearing hubs replaced and that seemed to have fixed my vibration. Jack up the front of your truck and see if you can make the wheels shift up and down. If there is a substantial play in them then your bearing hubs are bad. Pretty weird how mine were replaced today. Also put on new Yokohama's and she drives like a new truck!! Hope this helps. Each hub is about $100 for the 2004.
 

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cupped tires usually imply that you have bad shocks...as far as your rotors being warped, you will also definately feel your brake pedal move up and down (aka pulsating) while braking too in addition to the noise you hear.
 

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Cupping is also an indication of lack of rotation or just plain shitty tires (like Goodyears). The vibration wouldn't necessarily be at all speeds; radial runout starts showing up as a vibration around 65 mph.
 

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Cupping is also an indication of lack of rotation or just plain shitty tires (like Goodyears). The vibration wouldn't necessarily be at all speeds; radial runout starts showing up as a vibration around 65 mph.
lol I rotate my tires once every..well every time the front starts to cup. ~10k miles. I know I should do it more often but I'm too lazy. However, I rotate them every time I pull a trailer for more than 200 mi cuz it destroys the front tires.
 

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Discussion Starter #7
Just to follow up, I took my truck to the dealer today.. they claim that all my suspension components are tight and that the vibration is due to the crappy Goodyear tires (right on, Remerson228, thanks).

David Reed
 

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Another follow-up.. the Dodge dealer finally got the part necessary for road-force balancing the 20" chrome-clad wheels (which is why I didn't have that done previously). Anyway, after the balance the vibration is substantially reduced and the truck drives much smoother all around. Note that I had Sears and Mr Tire do a standard wheel balance first; neither of these helped very much at all. The road-force balance process is what did the trick for me.

David Reed
 

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A footnote on road force balancing - it typically does NOT need to be done every time you have the tires balanced. Once road forced, a regular spin balance works of for a while. If a spin balance doesn't fix it, then it's time to road force again.
 

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Road Force???? What is that...
 

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Cupping is also an indication of lack of rotation or just plain shitty tires (like Goodyears). The vibration wouldn't necessarily be at all speeds; radial runout starts showing up as a vibration around 65 mph.
:smiledown:
I have to strongly disagree with your statement by bashing ALL "goodyear" tires
ANY tire can and will, cup, due to many factors....
Bad Alignment
Worn Suspension Componets
Bad Shock
Bad Wheel
Improper Balance
Improper Air Pressure
 

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What is road force balancing?
 

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What is road force balancing?
It balances the wheel while applying a load to the tire (similar to the weight of the vehicle while driving). Randy can elaborate further re: the specifics but generally, you are adding the reaction force of the road on the tire into the balancing equation and getting a better overall result.

Why don't all balancing operations do this? I imagine it's a rather expensive balancer and spin balancing works well in most cases.
 

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Shimmy and shake

I have a 2009 Dodge Ram 1500 4X4. I have a shimmy around 60. I have had my tires balanced for the second time and 4 wheel alignment. When I get up to 70MPH the passenger seat shimmy's back and forth one to two inches making a heck of a sound. You can barely feel the shimmy in the steering wheel. I had our local tire company check the shocks and verify the nothing is loose in the undercarrage. I have been unable to find the problem. Any suggestions?

Thanks,
Rich Fields
 
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