2017Tahoe 4x4 making weird low hum - front left

[OR VietVet]

Did you check front diff and rear diff fluid levels and for cleanliness? Noises travel around in these rigs. But now I am leaning toward a tire noise but you can rotate and see if noise follows.

 

[swathdiver]

Probably a hub.

 

[TahoeFL2017]

Put it on jacks and both front wheels spin normally with no weird noises

Tires maybe?

I’m guessing bearings/hubs are ok because no noises up on jacks, correct me if I’m wrong on this still trying to figure it out

 

[wjburken]

Put it on jacks and both front wheels spin normally with no weird noises

Tires maybe?

I’m guessing bearings/hubs are ok because no noises up on jacks, correct me if I’m wrong on this still trying to figure it out

What did the Cv axles look like? We’re the boots intact?

The challenge is wheel bearings can be in the initial stages of failure and with out the load of the vehicle on them, they won’t exhibit any issues.

 

[B-train]

I agree with OR VietVet about checking the condition of the front diff fluid. If you've never changed it, it's a cheap thing to do and then you'll get a look at what comes out. The older generation of yukons with all wheel drive used to develop a rhythmic moaning sound and it was usually front diff bearings that were wearing.

I know you jacked it up and spun the tires,but I would advise getting all 4 tires off the ground SAFELY. At that point you can let the truck idle in drive in 2wd and 4wd and see if you notice any noise. A mechanics stethoscope comes in handy as well to listen to the hubs with wheels spinning from the back side. Again do all of the SAFELY. I've done this numerous time to diagnose wheel bearing and it works good most of the time.

 

[OR VietVet]

I agree with OR VietVet about checking the condition of the front diff fluid. If you've never changed it, it's a cheap thing to do and then you'll get a look at what comes out. The older generation of yukons with all wheel drive used to develop a rhythmic moaning sound and it was usually front diff bearings that were wearing.

I know you jacked it up and spun the tires,but I would advise getting all 4 tires off the ground SAFELY. At that point you can let the truck idle in drive in 2wd and 4wd and see if you notice any noise. A mechanics stethoscope comes in handy as well to listen to the hubs with wheels spinning from the back side. Again do all of the SAFELY. I've done this numerous time to diagnose wheel bearing and it works good most of the time.

Mechanic's stethoscope, 12 volt test light and DVOM are my most used tools, besides my eyes.

 

[B-train]

I forgot to mention that you'll probably need to turn off traction control in order to let the wheels spin freely

 

[TahoeFL2017]

Sounds like it needs to go up on a lift, local shop will do it for me. I’ll reply back after, appreciate all the replies!

 

[tungsten]

If noise changes when turning its wheel bearing,tire would make noise if its feathered a little.I have some Goodyear Wranglers that are worn.The noise they make youd swear the front diff is falling apart.

 

[TahoeFL2017]

Drove it again today, there is some drag on the power, slight, but there, and the noise is more of a moan if you listen closely.

Louder with the windows UP, so I'm thinking hub/differential, it kinda sounds like all wheel drive in engaged but it's not.