Fit Note: 4.88 Ratio, Less Trailer Towing, With Gas Saver Trailer Towing, With Heavy Duty Trailer Towing, With Standard Trailer Tow Prep Pack, Narrow Frame (Chassis Cab), Wide Frame (Pickup), Payload Downgrade - Level II, Payload Downgrade Package, Payload Upgrade Package B, With Base Payload Package, With Payload Upgrade Package, Rear Axle Limited Slip Differential