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Old 05-06-2007, 04:20 AM
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Massive vibration at 30mph: HELP!

I recently had a valve stem replaced in my from right wheel.

Not sure if it has anything to do with this.

My truck is a 2000 Dakota 3.9l Standard Cab.

This past week, I have been having massive vibration with the whole truck, especially the steering wheel. This only occurs when I have the gas pedal pushed, right around 1500 RPM around 30 MPH. If I let off the gas, the vibration goes away. This doesnt happen any other time, just around that range of speen and RPM.

I am not a mechanic, and not sure if it has anything to do with the wheel. All tires are at 32psi. Wheels are all torqued to 100lbs.

I am planning on taking the tuck in to the mechanic, just checking if anyone has experienced this problem.

Thanks for your time.
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Old 05-06-2007, 04:29 AM
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When was the last time you did a tune up? Sounds like your motor is struggling/bogging down.
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Old 05-06-2007, 01:46 PM
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Massive vibration

I just had an oil change 2 weeks ago. Plugs and wires are not anymore than 2 months old. I have a feeling its something in the wheel area, or something a lot more serious.

My question is why would it only happen at 30mph?
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Old 05-06-2007, 02:37 PM
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It almost sounds like when they replaced the wheel either they didn't get the wheel centered on the studs before they tighten the lug nuts or they didn't re-balance the wheel. Take it back to them and have them check it out.

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Old 05-06-2007, 03:40 PM
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Quote:
Originally Posted by Pardee
.....This only occurs when I have the gas pedal pushed, right around 1500 RPM around 30 MPH....
That's telling me that it sounds more like a drivetrain problem than tires but It would be a good idea to have the tires rechecked.
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Old 05-06-2007, 04:07 PM
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Get the wheel rebalenced. Its the cheapest and easiest place to start..
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Old 05-06-2007, 04:12 PM
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I would think that if it's the wheel it would be that way most of the time not just at that rpm or speed. But as was said, it's a good place to start since it happened right after the valve stem was replaced.
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Old 05-06-2007, 05:55 PM
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Quote:
Originally Posted by Daktari
I would think that if it's the wheel it would be that way most of the time not just at that rpm or speed. But as was said, it's a good place to start since it happened right after the valve stem was replaced.
Actually that is not the case, a vibration can be rhymthic and be present at all speeds but be at its worse at a certain speed. Usually I find an unbalanced tire is really bad around 55 and not so bad above and below but present..
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Old 05-06-2007, 05:59 PM
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check your u-joints....bet you'll find your problem.
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Old 05-06-2007, 07:05 PM
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Quote:
Originally Posted by wreckless123
Actually that is not the case, a vibration can be rhymthic and be present at all speeds but be at its worse at a certain speed. Usually I find an unbalanced tire is really bad around 55 and not so bad above and below but present..
i second that. My gf's celica had a wheel balanced wrong, it would only do it at around 70 mph, so on I95 I did 80 the whole time just to get rid of it.
But yeah check you u-joints and your driveshaft for slop.
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Old 05-07-2007, 01:35 AM
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Massive vibration

I had messed around under the truck today.

I did find that the drive shaft u-joint (if thats what it's called), closest to the tranny, has some side-to-side play in it. Maybe around 1/16"

It is going to the shop tomorrow for a checkup.
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Old 05-07-2007, 03:14 AM
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They definately didnt rebalance the tire when they replaced the valve stem. Anytime you break a tire off a rim it has to be rebalanced or it will vibrate its ass off just like your finding out. Who ever did the work sounds like a moron.
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Old 05-08-2007, 07:10 PM
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Massive vibration

Just got the truck back from the mechanic.

It was the front u-joint.

He replaced front and rear, Im glad it was nothing in the rearend or anything internal.

Thanks for the help guys.
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Old 05-28-2007, 08:49 AM
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I know your issue has been resolved, but I just wanted to say that ANY side-to-side play in a u-joint indicates a bad or failing joint. They should be tight and petty much unmovable.
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