2015 Yukon Denali Metal to Metal clacking noise when coasting while driving (off gas slowing down)

[Denali2boojie]

I have a 2015 Yukon Denali, it is lifted with 35’s, the lift has about 1500 miles on it now, I have had no issues up until recent. The issue is I’m getting a pretty loud metal on metal clacking or tapping  noise from some where in the front diff or transmission. It is most predominate from speeds 30mph down to about 10mph. The noise will start when I let off the gas while driving to coast or slow down, it will do it intermittently at higher speeds but not near as much but it is the same issue for sure. It seems like it starts after I let off the gas and the rpms drop down to around 1200 or less in a coast. The noise will start off not as loud and progressively get louder if I coast without touching the gas. As soon as i touch the gas the noise will go away, it does not do this in manual mode only in automatic. I have had the lift looked over multiple times and now I don’t think it has anything to do with it other than the additional Strain may have caused and already underlying problem to become more profound. Any help on this matter would be greatly appreciated! 

Edited March 30, 2019 by Denali2boojie
Added year model to title