I have a 2013 Suburban and It is only good in 2WD mode and if i change it to AUTO or 4WD in selector , it makes a noticeable noise really bad.
anyone have same issue like this? please help me!! Thanks in advance~~

 

Something in FWD mode is making noise. Can you pinpoint down where the noise is? Have you checked or changed the fluids yet? I'd recommend Royal Purple or Redline. Yeah, they are not cheap, but they are full synthetic fluids and well worth the money.

 

It could possibly be the front differential unit, had the same issue and a chunk of the ring gear broke off. It's common cause the front diff gets constant wear in auto

 

make sure all the tires and wheels are the same size and circumference....any mismatches can cause this noise.

 

thanks all, It is not like small or minor noise, the tires and wheels are same size, but in auto or 4wd it is just unbearable. before going to see mechanic , want to have some ideas.

thanks again.