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The Rancho RS6511 and RS6511B Super Duty suspension package starts with a competition radius arm upgrade. The new heavy duty tubular-style radius arms bolt directly to the Ford F-250 and F-350 O.E mounting location without cutting or drilling. While adding superior strength and stability to the suspension, the new radius arms restore the caster angle to an optimal setting. Computer-calibrated, state-of-the-art coil springs (available for all engine options) improve both ride quality and performance. Steering integrity is uncompromised though the use of a new forged pitman arm that ensures optimal steering geometry and eliminates bump steer. The Rancho Suspension RS6511 and RS6511B 4" lift allows for the re-use of the stock wheels and fits up to 35" or metric equivalent diameter tires! No cutting, welding, drivetrain or exhaust modifications are necessary, making this a complete bolt-on suspension lift system. Rear height is increased 2.5" inches using rear spacer blocks and longer U-bolts. Track bar relocation bracket, extended sway bar end links and brake lines round out an impressive list of easy-to-install features. To accompany the industry's finest suspension system, you need the industrys best adjustable shock absorber, the Rancho RS9000X. The advanced nine-position adjustable design allows owners of Rancho-equipped Super Dutys to manually or remotely (from the cab) tune damping to match a vast range of performance situations. For those who demand maximum off-road performance and a custom look, be sure to ask about the ALL NEW RS9000X Pro Series Remote Reservoir shock absorbers. Experience the Rancho difference and uncompromising performance both on and off road. Rancho is dedicated to offering you the finest engineered, highest quality products at the most affordable price. This item fits the new 2005 and 2006 Ford Super Duty F250 and F350 4x4 single rear wheel trucks equipped with an automatic transmission. This kit is not designed to fit dual rear wheel trucks or manual transmission equipped Ford trucks! Rancho offers this Super Duty 4" suspension lift in either Rancho Red or their Outlaw Black powder coat finish, so be sure to select the kit color you prefer using the drop down selection boxes located beneath this item description. The coil springs used with this Rancho lift are engine specific, so please be sure to select your engine type when placing your order! For additional information please click on the "ask a question" link located at the very top of this page. This item ships for FREE via standard ground service to all addresses located in the contiguous 48 United States of America!
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