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Weird Noise And Vibration

sahls01gmc

By sahls01gmc
in Ask A GM Technician

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sahls01gmc Senior Enthusiast

sahls01gmc

Posted
Posted

I have an 01 2500 4x4, and there are some weirds noises that I can't figure out. When the truck is accelerating, I can't hear anything, but I can when it is decellerating or not under load. It sounds like a piece of metal is rattling around the driveshaft, transmission area. It is very rythmic like the driveshaft turning or something like that. I can't hear it unless the truck is moving more than 10 mph or so. The U-joints have been replaced, and I've checked them and there is no slop at all. It makes this noise even when you put the truck in nuetral and just coast. Then, on the highway one day, I noticed a weird vibration when I would between 60 and 75. It sounded like I had instantly put on mud tires on my truck.

 

Could this maybe be the transfer case, or something related to the 4 wheel drive? Other than the vibration I heard on the highway, the truck doesn't seem to be doing anything else weird. The brakes feel the same as they always do, steering is fine, 4 wheel drive works fine, and it's not leaking any fluids anywhere.

 

Anyone have any thoughts?

 

Thanks

 

James

AFD256 Enthusiast

AFD256

Posted
Posted

I have an 01 2500 4x4, and there are some weirds noises that I can't figure out. When the truck is accelerating, I can't hear anything, but I can when it is decellerating or not under load. It sounds like a piece of metal is rattling around the driveshaft, transmission area. It is very rythmic like the driveshaft turning or something like that. I can't hear it unless the truck is moving more than 10 mph or so. The U-joints have been replaced, and I've checked them and there is no slop at all. It makes this noise even when you put the truck in nuetral and just coast. Then, on the highway one day, I noticed a weird vibration when I would between 60 and 75. It sounded like I had instantly put on mud tires on my truck.

 

Could this maybe be the transfer case, or something related to the 4 wheel drive? Other than the vibration I heard on the highway, the truck doesn't seem to be doing anything else weird. The brakes feel the same as they always do, steering is fine, 4 wheel drive works fine, and it's not leaking any fluids anywhere.

 

Anyone have any thoughts?

 

Thanks

 

Hey Jim, I have 01 1500 and got the same vibration turned out to be the alignment. As far as the rattle, I had what I thought was the heat shield or something. Everytime I hit a rough road it sounded like sheet metal that had worked itself loose. The mechanic said it was my cat converter, the honeycombs (baffles) had rotted and were banging around. Hope this helps alittle to narrow it down

Chris

sahls01gmc Senior Enthusiast

sahls01gmc

Posted
  • Author
Posted

Thanks Chris, I'll start checking everything around the front end.

 

Like I said though, the rattling is very in synch with the rotation of something. It's not a random rattle like a kid playing drums for the first time. It's almost as if someone put a zip-tie around something that rotates, and it's hitting something solid.

 

James

  • 2 weeks later...
sahls01gmc Senior Enthusiast

sahls01gmc

Posted
  • Author
Posted

Anyone have anything to say at all?

 

I really need some help with this....

 

Am I not saying the right thing, or not describing it well enough?

 

I see other people get more responses, but I still need help just as much as them.

 

Please help me.

 

 

 

THanks

 

James

mmmikkke Senior Enthusiast

mmmikkke

Posted
Posted

There is a piece in the transfer case that can fatigue and break loose, that might be causing a problem like this. You should search for posts in the HD forum about the transfer case... Usually it fatigues, and breaks off, and causes a fluid leak, and some kind of interference with the parts inside. But I'd guess it's possible for it to break off but not actually break a hole in the case as it usually does. Then it would match your symptoms.

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