Hey muddy, I had crazy grinding/vibration issues,I thought the same thing being the axles! But I finally tie it down one day putting on a trans drop kit, and found that a trans mount bolt wiggled loose and was causing crazy noises! Not sure is your issue wanted too share mine, I chased it down for months! It's easy to check and could save you time.I also cleaned the bolts and lock tite, so those suckers wouldn't come loose again! Btw rig is looking sick now! I'm really considering those iro long arms. How's the ride now with la's and bills?