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Rear End

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Because the framerail measurements of the '05 F-150 are identical to the framerail measurements of the '05 Expedition, the guys at FST were able to cut the rear of the solid-axle suspension frame from the F-150 and replace it with the IRS frame and suspension from the Expedition. Once in place, the guys at FST designed a custom 4-inch suspension lift using Bilstein struts. They also upgraded the rear trailing links with custom FST 7075 aircraft-aluminum trailing links that feature QA1 spherical rod ends. FST says that the IRS now generates more than 10 inches of suspension travel.