Hey everyone. I just got my 2014 4x4 back from les schwabs where I had them do a 2" level. Looks good, but there's a pronounced hum at any speed above 35 mph. Is this normal? More air getting under the truck and making noise?

Nothing seems to be rubbing.

Thanks.

 

you have it aligned afterward?

 

if not, probably that

 

Put it in 4x4 and see if hum goes away.

If it does, then they installed incorrectly and you have a shot IWE.

 

It goes away when I engage the 4wd.

 

They damaged an IWE during install or did not hook up vacuum line

 

I checked the vacuum lines. Both appear to be connected and they don't seem to have any holes or cuts. Could it be the IWE solenoid? I was going to buy one and just go ahead and replace it. But my ford dealer's service dept is closed today.