2000 Silverado vibration at 35mph???


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Old 03-29-22, 12:19 PM
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2000 Silverado vibration at 35mph???

2000 Silverado,
4.8L V8,
3door ext. cab.
268,000 miles

There is a vibration that I am trying to track down. It is worst at around 35mph. Don't really feel it below that, it starts increasing as I approach 35. Once I pass 35 and keep going faster it seems to go away. I feels mostly like it is under the truck. I don't feel it in the steering wheel so I don't really suspect something in the steering or a rotor. RPM doesn't seem to matter either. I can be going along at 35-40 and let off the gas and it stays about the same.

I have been trying to read up on what it might be and some of the things that I have seen that people have had problems with were:

bad motor mounts - if I have it in park and idling and rev it up some, the engine doesn't seem to move position. But I don't know if that is a good check or not.

warped rotors - some people have said this but like I said I don't feel the vibration through the steering wheel and when braking I don't feel the usual shimmying that you feel when the rotors need to be turned.

I recently had the carrier support bearing for the drive shaft replaced, and I hoped that maybe that would do it but it didn't make any difference.

So here I am asking all of you guys what you think. Thanks for the input.

 
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Old 03-29-22, 12:32 PM
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Wouldn't be bad motor mounts.... and not likely rotors.

It's speed related......
possible tire. (most likely)
wheel bearing.
constant velocity joint on front end if four wheel drive.
You had the carrier support bearing replaced. Did they check the front and real universal joints ?
 
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Old 03-29-22, 03:00 PM
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truck in 2 wheel drive. sorry didn't mention that.

I can't say if they checked the universal joints or not with 100% confidence. I would assume but you know what that gets you. I will check with the mechanic. Tires are fairly new Michelins and look very good.
 
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Old 03-29-22, 04:41 PM
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I've got a buddy with an older truck, he's had vibration issue and said it was finally resolved with either a drive shaft or u-joint replacement.
 
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Old 03-30-22, 09:20 AM
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Lots of possibilities. Have a friend drive next to you down the road to see if one wheel is hopping or otherwise out of round. After that, put it on a rack and start evaluating pieces.
 
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Old 03-30-22, 10:00 AM
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I read somewhere long time ago that 35 mph is the optimum speed for tire issues to show themselves, out of balance or out of round.

Last time I had issue like that on wife's car it was a CV joint.
 
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Old 03-30-22, 11:46 AM
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would also suspect a tire, even if they are new most vibrations at lower speeds are often a tire problem.
 
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Old 03-30-22, 03:08 PM
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After a particularly bad year for pot holes, I had a nasty vibration in my car which turned out to be an out of balance wheel - the faster I drove, the worse the vibration.
 
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Old 03-30-22, 04:06 PM
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I will see about getting the tires balanced next I think. I took it for a drive today for about 30 minutes. When I got home with it, I got under it and put my hand on each of the 3 U-joints. None of them were hot or even warm, which I would have expect them to be if one of them was bad. So I think it is going to be balancing of tires next.
 
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Old 03-31-22, 12:34 AM
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None of them were hot or even warm
That's because they dont rotate, they just spin along the axis of the shaft. The only movement in a u-joint is the back and forth of the angle is of the joint.
 
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Old 03-31-22, 02:47 AM
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I've always checked U-joints for play with the transmission in neutral. Rotating the driveshaft a tad will let you know if there is play from a worn joint.
 
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Old 03-31-22, 03:31 AM
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Originally Posted by kmeyer301
So I think it is going to be balancing of tires next.
First, I'd inflate all the tire to their maximum PSI, try driving around for a day on really hard tires, see if it feels different. Then check tire pressure the next day. Having one tire a BIT lower pressure than the other can also give a shake, even though each tire is actually balanced.

 
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Old 04-07-22, 03:20 AM
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Well, took the truck and had all 4 tires balanced yesterday. That did not stop the vibration. Someone on another site suggested that it could be coming from the rear differential. Your thoughts on that?

Thanks
 
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Old 04-07-22, 09:57 AM
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You have a bad tire on it, check them closely you might be able to see the problem. You didn't say how many miles are on them but it could be an internal failure also.
 
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Old 04-28-22, 09:12 AM
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Michelin LTX M/S only 25K miles on them. They look fine on the outside and there was no change in the vibration when I rotated them front to back. Not sure it would be worth the expense of having them removed, inspected, remounted and balanced.
 
 

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