03-12 Ram 2500/3500 4X4;Drops Carrier Bearing on 2-Piece Driveshafts;Prevents take-off shudder/driveline vibration;Stackable 1/4 Shims for 1-4 Rear Lift;California Residents: WARNING Carli Suspension Carrier Bearing Drop - CS-CARRIERDROP-D The carrier bearing drop is needed for all 6 trucks that have a 2 piece drive shaft.