Not a Denali, just a 1500 5.3l, with the following options for the drive train: NP8 - transfer case active, two speed, push button, GU6 - rear axle 3.42 ratio, G80 - posi traction, limited slip, with a M30 - 4L60-E tranny. The noise seems to be frontal in nature. I would think if it was...