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I had a spring shop make mine, he said he could arch them up to 3" lift or as little as 1". I wanted about 1.5" but got closer to 2.5", I'm glad I got more than I had first wanted though.
He made me a new additional leaf for each side on the front, it ran about $150 with shipping IIRC. My stock front springs had two leaves that were rated at 4800#. The additional leaf boosted that up by 1200#(total 6000#, same as plow prep pkg) and gave me enough lift that the truck sits just about level. The new leaf is almost as thick as the two stock ones put together. I have heard guys talk about having springs re-arched before, find a local spring shop and talk to them as they'd be in a position to know what is and isn't possible...
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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