Whine from rear. Rear end or driveshaft?

[Jeffrey Howell]

My 2008 GMC Yukon has a noticeable whine coming from the rear, under acceleration at highway speeds. I cant tell if it is a rear end problem or a driveshaft u-joint. Any suggestions on what to check?
Thanks!

By the way, it's not coming from my wife complaining about my driving.

 

[avalonandl]

Drive shafts dont whine.

How many miles. Likely Pinion gear or bearings.

 

[Jeffrey Howell]

Drive shafts dont whine.

How many miles. Likely Pinion gear or bearings.[/QUOTE

145,000 Sounds more like rear end than bearings

 

[Doubeleive]

generally the pinion bearing or wheel bearings will whine, the carrier in my experience will not whine but will make other heavier sounds, clunks, etc.
you might want to pull the rear wheels off and check to see if there is any axle grease coming out of the seals and look at the pinion, grab the pinion and see if it has any play in it.

 

[Fless]

My 2008 GMC Yukon has a noticeable whine coming from the rear, under acceleration at highway speeds. I cant tell if it is a rear end problem or a driveshaft u-joint. Any suggestions on what to check?

Differential fluid level, and condition if you can get some out.

 

[Jeffrey Howell]

generally the pinion bearing or wheel bearings will whine, the carrier in my experience will not whine but will make other heavier sounds, clunks, etc.
you might want to pull the rear wheels off and check to see if there is any axle grease coming out of the seals and look at the pinion, grab the pinion and see if it has any play in it.

Will do! Thank you

 

[Jeffrey Howell]

Differential fluid level, and condition if you can get some out.

I will try that this weekend. Thanks

 

[Dustin Jackson]

@Jeffrey Howell I agree with it being the rear diff. I had a Tahoe that had a whine coming from the rear that would go away when letting off the gas. I took the rear diff cover off and everything looked fine so I put it back together with some royal purple diff fluid and it kept making the sound. I just kept driving it with the whine.

 

[2591tdj]

My 2008 GMC Yukon has a noticeable whine coming from the rear, under acceleration at highway speeds. I cant tell if it is a rear end problem or a driveshaft u-joint. Any suggestions on what to check?
Thanks!

By the way, it's not coming from my wife complaining about my driving.

I have the same whine. Looking forward to what you uncover as the cause.

 

[theycallmecoyote]

Jack up the rear and check the wheels for side to side play, *should* be able to rule out wheel bearings that way.