2007 tahoe whining noise while in drive..

[Epadams91]

Hey yall, my 2007 tahoe v8 4wd has started making a very low whining noise while in drive and accelerating only. You let off the gas and it stops and it doesn't do it in neutral or park. The transmission shifts fine everything else drive wise is perfectly fine. When I first take off I caint really hear it until i get to about 20-30mph i let off the gas it goes away. If anything is on in my truck air radio anything like that you caint hear it and it doesnt really get louder but you can tell it's there especially when I let off the gas and then touch it again. To me it reminds me of how deep tread new tires sound just maybe not as loud??? Any ideas? Thanks