rumble in auto 4wd? dealer told me it's normal?

[GIZZ]

I've searched this before and there are differing opinions on it.

My 2009 2500 Suburban has a loud rumble from the front end while in auto 4, when I hear the noise and switch to 2wd the noise instantly goes away. I'm thinking diff bearings or trans case, has to be something. My old 2007 tahoe LTZ was silent in auto 4, I used it all the time. I mentioned this at the dealer and they said that's normal and I was lucky my LTZ didnt make noise? Knowing my Tahoe was quiet, I really don't mind paying to make this Suburban right, if it will save me from grenading something later.

My suburban got worked over by the tow company, I hear the noise after it was being towed then dragged from the rear with the front wheels on the ground. It's currently at the dealer getting a quote for the tow company.

 

[Doubeleive]

my 2000 made some discernible front differential noise when in 4wd it wasn't terrible but I could hear it

 

[Rockytfox]

Yeah something definitely sounds off here. My 08 Yukon hybrid would make a rattling noise in auto 4. The noise was coming from the drivers side CV joint. After replacing it, the noise went away.

 

[PG01]

It shouldn’t make noise that you can hear. You might think you hear something but you feel it more than hhear it. I just had mine in auto going down a friends steep snow covered driveway and left it in when i left I forgot about it but i know my truck and realized it immediately, my wife would drive around in 4 hi and not think twice... something is wrong with yours, dealer is blowing smoke.

 

[GIZZ]

I agree with you. The shop I work at is the same way, guys would rather do regular services and brakes then call a job that they couldn’t make good time on. If that job rolls for them it’s “no fault found” no matter what. My burb has been there since last Tuesday! I was going to be nice and let them do the easy brakes and hubs too but now I’m going to do it myself. Likely will take it to the driveline shop I deal with, I still need that unbiased diag and quote.