2004-2008 Ford F150 Rough Country Suspension 6 Inch Lift

10. A crossmember brace (shown) fastens to the front and rear crossmembers on the passenger side to create added strength. Also installed between the front and rear crossmember on the driver side is a new differential skidplate that also serves as a support brace similar to the passenger-side crossmember brace. Following that step, new sway-bar drop brackets are installed.

17. Overall, the rear suspension lift is very simple. Here you can see the finished product on the driver side. Visible is the new 4-inch cast-iron lift block, U-bolts, and premium Nitro 9000 shock. Not visible, but also included in the kit, is an emergency-brake-cable drop bracket and brake-line relocation brackets.

Bottom line
The truck we installed the kit under was shod with 35x13.50-20 Mickey Thompson ATZ tires mounted on 9.5-inch-wide KMC Hoss wheels. Naturally, this combination rode a tad stiffer than the stock F-150 with 17-inch wheels that we've driven in the past due to the decreased sidewall of the 35x20s. Overall ride quality was good though and still smoother than a 3/4- or 1-ton truck.

We ramped a similar stock F-150 on a 20-degree RTI ramp, and it climbed 58 inches to generate an RTI score of 417. The lifted truck climbed 55 inches to generate a score of 396. Frankly, we're not surprised the RTI score dropped slightly after the install as adding leaves to rear spring packs tends to stiffen things up and inhibit flex. Keith Lovins, product development manager at Rough Country, says; "Rough Country used an add-a-leaf in the rear to keep from stacking lift blocks. Instead, we used a 4-inch block to replace the stock 2-inch block and added an add-a-leaf in the spring pack. This decreased the amount of flex in the rear by 3 inches on a 20-degree RTI ramp, but the advantage is that the towing capacity is increased and the stability of the truck is increased at highway speeds. We at Rough Country feel that an F-150 will be used as a work truck or a tow vehicle and that towing capacity and stability is more important than losing a few inches on an RTI ramp." Hey, we're down with that logic. Improving approach, departure, and ground clearance while retaining work capabilities-on a budget-works for us.