Compatibility For 2006-2008 Dodge Ram 1500 4WD Only *TRX Models Will NOT Fit 3" or 3.5" Front Spacer *Does Not Fit Mega Cab* / Rebel Models / Warlock Models *The width of U-bolt is 3.6", for 3.5" Rear Axle Only, will NOT fit 4" Rear Axle, Please check you rear suspension setup before ordering. How to Buy the Right Kit to Level Your Truck .