Yeah, I really hope you reversed the 2 and 5 by mistake! Anyway, I, too, have experienced the grinding noise with my lift/tire setup. I attributed it to either tires rubbing or traction control. However, it sounds awful. I'm glad to see some posts assuring me that it's nothing to be concerned about.
2006 Jeep Commander 4.7L 4x4 Light Khaki w/ OEM Charcoal Wheels, Rough Country 2" Lift, 255/75R17 BFGoodrich Mud Terrain T/A KM, Graco Child Booster Seat w/ optional 4-Year-Old Daughter, andSig Sauer P228 9mm in Glove Compartment.