Groan, grinding sound/feel, load at 1800ish RPM

[mjwills]

Thanks for the update. I will take a look for anything that seems out of place. So far I have replaced the exhaust hangers (which I think you are referring to here), trans and engine mounts and front hub bearings. All of this has helped reduced the amount of noise and vibration but it still exists. As the weather has gotten warmer it seems reduced but I am still at a loss. One thing I have noticed is that when I hear/feel this most there is also clunk when downshifting. When the clunk is not there the noise/vibration doesn't seem to be there. Not too sure if it is related or where the slop is, multiple shops have told me everything is solid in the drivetrain and suspension.

 

[ivin74]

Hi - I have a previous post about this, but I asked about 2 issues in previous post and want to separate this out.

2011 Yukon XL 2500. 85k miles.

At any speed (and any gear) around 1800 RPM I hear a loud wwwhhhaaaaa (if you can imagine that) and feel it in the chassis (floorboard), but a lot more on my left foot and slight vibration in wheel. Under or over that RPM it seems normal.

A dealer told me it is a groan in the exhaust, but this seems more like a drive train thing to me, like you can feel something loading up then it goes away. Could it be the front diff? Torque convertor? Flywheel or driveshaft out of balance?

Thanks!

I belive your cats are shot. when the cat internals go out they rattle around 1800rpms.

 

[t_bergman]

Thanks for the update. I will take a look for anything that seems out of place. So far I have replaced the exhaust hangers (which I think you are referring to here), trans and engine mounts and front hub bearings. All of this has helped reduced the amount of noise and vibration but it still exists. As the weather has gotten warmer it seems reduced but I am still at a loss. One thing I have noticed is that when I hear/feel this most there is also clunk when downshifting. When the clunk is not there the noise/vibration doesn't seem to be there. Not too sure if it is related or where the slop is, multiple shops have told me everything is solid in the drivetrain and suspension.

Yes, I am talking about the exhaust hangers. Mine have quite a bit of play in them.