Anyone wanna play internet diagnosis (08 Yukon XL suspension noise)

Daan1998 said:

My 08 Yukon XL has just started to make a weird noise. 60-75mph it’s a kind of humming or thrumming vibration. The tires are less than a year old, the front springs and struts/shocks are about a year old, a shop inspected it like 1.5 years ago and replaced the ball joints (I don’t know if they did upper or lower or both and I can’t find the paperwork for it now)The front differential was replaced last fall. I put load range E tires on it because we pull a big travel trailer, so I know they’re heavy tires that will ride rougher than the set we had before especially aired up to 80psi. My wife drives the truck to work (75-ish miles round trip) she hasn’t noticed anything other than the rough ride until a week or so ago. The truck tracks straight, it doesn’t bounce or act squirrely, it just feels like the engine has to push harder to get it up to speed and once it is, it makes the weird thrum. It doesn’t change pitch but it goes away below 55 or so. The last time I had it looked at I wondered if the wheel bearings were bad but that’s when they found the differential issue which completely went away after that service (and they said the bearings were fine)
I’ve had a couple wheel bearings go bad on my van and it started out like this but got much louder and more noticeable right away. I know hanging heavier tires on the truck can cause additional bearing wear, but it’s been since last fall that the tires were put on and it took until now for anything to change.
Sorry about the novel here but the 2 shops in my area can’t get me in until towards the end of august and I have 3 more trailer tows to do this summer yet… I don’t want to lose a wheel while pulling the camper or something.

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15burban said:

I 2nd checking the wheel bearings.

Not to go off topic but do you run 80 psi in the tires all the time?

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j91z28d1 said:

you sure it doesn't change tone or frequency when you're on and off the throttle at that speed? like seems better at full throttle, worse at cruise and better if you manually down shift off the gas?


are you hearing a Humm or feeling it?

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Daan1998 said:

I tried putting it in Neutral while on the freeway a couple times-the noise stayed the same and didn’t change with the engine revs. I think part of it is the wind noise covers it up so I just can’t hear it. I think I feel the vibration as much as hear it, if that makes sense.

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j91z28d1 said:

I just always think of drive shaft vibrations when I hear of odd vibrations. I think have ptsd from chasing a vibration for years in a different car and it ended up being a simple drive shaft.

hopefully it's something else thou.

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