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  #1  
Old 01-11-2011, 02:16 PM
Royboymz Royboymz is offline
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Default Vibration through floorboards/seat

I am new to this forum. I do have a question that hopefully someone can help me with. I have a 2008 Ram 1500 Big Horn 4x4 with 28,000 miles on it that I purchased new in April 2008. Last year it developed a vibration between the speeds of 50 to 65mph. It never seems to go completely away but is tolerable at other speeds. I have had the truck back to the dealership 3times in the past year for this issue and they always seem to try to link it to my tires. I first had the tires balanced and rotated, then put all new tires on it (4000 miles ago). This last time i took it (last Friday) i asked them to check all the front end components, the drive shaft and the rear end. After spending only an hour on the truck the proclaimed that there was nothing wrong with my truck and they wouldn't look at it again until I have the tires road force balanced, which I am having done today. The vibration seems to come mostly through the floor boards and seat with a little vibration in the steering wheel. There is no vibration from the rotors while breaking and there is a little hesitation/shuttering feeling when accelerating from a complete stop.
I would greatly appreciate any insight into this issue.
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Old 01-11-2011, 03:51 PM
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RamTech RamTech is offline
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Road force imbalance is typically felt at 65 mph and up. It sounds to me like the dealership you're using doesn't have anyone properly trained in noise, vibration and harshness. If they want to eliminate a tire issue, they can swap on a different set of rims and tires and road test the truck. Beyond that, they should have a couple of different electronic vibration analyzers in their special tools that will narrow down the problem.
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Old 01-13-2011, 12:33 AM
WickedSix WickedSix is offline
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I have the same issue with my truck but it is a 2500 and the speed I get the vibration is between 25-40.
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Old 01-15-2011, 09:41 AM
Royboymz Royboymz is offline
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Default Thanks for the replies

Thanks for the replies. I took the truck to a local garage for the road force balancing and found that one of my new tires is so far out of round that it is impossible to balance it and that I may have a bad rim. So I will update when I have them replaced and let you know if it has completely fixes the issue.
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Old 01-15-2011, 11:50 AM
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I chased a similar vibration. A "rough running" (tech's description) intermediate bearing in the driveline was replaced, as was the rear u-joint. It helped but it was still there and got worse at 65 mph and above. We swapped out my 18" wheel/tire combo for a set of stockers. It looked goofy (see pic below) but it was smooth as glass.

So, it was isolated to the wheels/tires and I took it down to the shop that sold them to me for a road force balance.

All 4 tires were outta spec. Three were indexed on the wheel to counter balance with the wheels. One tire was replaced. No more vibration.





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Old 01-15-2011, 11:53 AM
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BlackBullet BlackBullet is offline
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i know its low mileage, but you can check your u-joints too.
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