Wa wa wa would make me think tires but only under power would make me think maybe pinion bearing?
3rd generation jeeper
04 gmc Sierra 2500 crew cab quadrasteer tow pig
87 yj Laredo amc360/ax15/231 amc20/dana30 410s and truetracs
efi 2.5, t5, built231HD (atlas soon),d44s with 4.88s and detroits