Note: For 4WD 4x4 Single Rear Wheel Without Overload Springs, 11.50 Axle, 4" Inner Round U-Bolt. Dodge Ram 2500 2003-2008 4WD Single, W/O Overload Springs; 11.50 Axle W/ 4" Inner Round U-Bolt. Dodge Ram 3500 2003-2008 4WD Single, W/O Overload Springs; 11.50 Axle W/ 4" Inner Round U-Bolt.