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Vibration

csg11

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csg11 New Member

csg11

Posted
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Need help with a diagnosis, please. I just put a deposit on a 2000 Sierra 3/4T, 3:73s, 454, crew cab, 34,000 miles. Drove it home to try it for a couple of days.

 

When I test drove it at the dealership two days ago I complained of howl from rear tires and noted they were cupped on each side of truck. Fronts were worn down more, but not noticeably cupped. And I felt a vibration at all speeds.

 

Today it has all new tires, howl is gone, but there is still a remarkable vibration at all speeds. The mirrors jiggle so much it is annoying. Vibration does not seem to be in the steering wheel and a little bit more severe around 45 mph.

 

Anyone got any ideas where to look? What is cupping usually a symptom of? Any other things we should look for in this truck/engine combination (my 1st 454)?

 

I am taking it in for an inspection on Monday before we sign any papers.

 

Thanks.

Gary

Shaners Senior Enthusiast

Shaners

Posted
Posted

I've seen carrier bearings, that will cause a driveline vibration.  It could also be a U-joint too.  And you don't want to rule out a driveshaft problem either.  Actually it could be a bunch of things...

 

Your new truck should still have 2K miles left under warranty, so I'd have the dealer fix it.

 

Enjoy the big block!!!  My buddy has a 2000 (old body style) ex-cab short bed 4x4 with the 7.4L and 4.10 gears.  He gets between 11 and 13 mpg's with it and he loves it!!!

 

Good luck and welcome to the forum!!!

Bob G. Enthusiast

Bob G.

Posted
Posted

I used to have a 1988 GMC 2500 Ext Cab/Long Bed with a similar vibration. I replaced the u-joints and it helped quite a bit. The last piece of the vibration puzzle was the carrier bearing. after having it replaced, the truck rode super smooth.

 

Bob G.

sfcmartint Enthusiast

sfcmartint

Posted
Posted

I agree with the drive line theories but you may want to look at one other element.  You mentioned cupping on the rear tires.  This may or may not be attributed to a bent rear spindle.  Truck may have been in an accident that your not aware of.  Just my 2 cents.

csg11 New Member

csg11

Posted
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Posted

Dealer cannot find a cause for the vibration. They think that maybe it is the tires although they have them balanced "as close to specs as they can get."

 

Now the want to send it for a Load Force Balance. Anyone have had this service? Will it be necessary each time it needs tires?

 

Thanks.

 

Gary

ClipperSkipper Enthusiast

ClipperSkipper

Posted
Posted

Now the want to send it for a Load Force Balance. Anyone have had this service? Will it be necessary each time it needs tires?

 

No just a decent set of tires. The cupped rear tires were rotated from the front. They were either run out of balance for an extended period, front end misaligned, or the belts have shifted. This truck should command $15-$16K.

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