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Username Post: '00 Chevy C2500 Vibration
djackson210
Poster
Posts 98
03-29-21 03:16 AM - Post#2817029    

My truck is a 2wd crew cab with the 5.7.

Between 30-40mph I've got a weird vibration. Doesn't appear until I reach at least 30 mph, peaks at 35mph & begins to disappear at 40mph & is completely gone at highway speeds.

If I hold the speed at 35mph it's bad. Feels like a bad tire. Meaning that it feels like a vertical vibration. I'd accept that it was a bad tire if I didn't have a brand new set of cooper's balanced with less than 1k miles on 'em. And if th vibration didn't disappear past 40mph.

I've never encountered a speed sensitive vibration so I'm at a bit of a loss here. My only thoughts are harmonic balancer or possibly driveshaft carrier bearing.

Any input/ideas are greatly appreciated.
'91 Chevy C1500 SC LWB
'89 Suburban 4WD

CowboyTrukr
"10th Year" Silver Supporting Member
Posts 4695
CowboyTrukr
03-29-21 05:22 AM - Post#2817046    

Have you rotated the tires front to back to confirm it’s not tires?
Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke

djackson210
Poster
Posts 98
03-29-21 05:56 AM - Post#2817050    

No sir I haven't done anything with the tires yet. I'm assuming, perhaps foolishly, that it isn't the tires. Because they're basically brand new & the vibration is only there between 30-40mph. I would think if it were tires it would be there at higher speeds also, but it isn't. It truly does disappear at speeds over 40mph.

If no one else has any other pointers/tips I'll definitely rotate the tires from front to back.

I was considering getting all 4 tires off the ground & running the truck to see if the vibration was there still with no weight on the tires.
'91 Chevy C1500 SC LWB
'89 Suburban 4WD

Silverado Kid
Newbie
Posts 42
03-29-21 08:36 AM - Post#2817063    

I worked on equipment all my life and I used to see other guys replace a part and then a new, different problem would emerge and I would watch them replace part after part trying to fix the new problem when it was the original part they had put on that caused it. Don't assume that brand new tires are perfect. Could also be that the balancing weights might have come off of one tire or the tires are flawed. Go for the most obvious first before you start throwing money at a problem that might not exist.
djackson210
Poster
Posts 98
03-30-21 03:22 AM - Post#2817109    

Well I reckon I'll swap the tires around & see where I'm at after that. Honestly I hope it is a tire issue. That'll be a helluva lot easier to fix than hunting down a vibration somewhere else.

I'll report back in the next day or so when I have a chance to swap em around.
'91 Chevy C1500 SC LWB
'89 Suburban 4WD

djackson210
Poster
Posts 98
08-04-21 05:50 AM - Post#2824447    

I forgot to update this post. Well I swapped the tires around & it made zero difference. So I just kept driving the truck until I sold it about 3 months back.

So maybe the next guy will find the vibration. :crazy :
'91 Chevy C1500 SC LWB
'89 Suburban 4WD

rockfangd
"8th Year" Gold Supporting Member
Posts 3149
rockfangd
08-05-21 03:55 PM - Post#2824578    

Lol.
Good for the update though.
Old School GM fan FOREVER

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