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here's the deal: in order to keep the amount of lift minimal, say about 8-9'' or so, just enough to clear 38's, you're going to have to cut out the massive IFS frame crossmember in the front of your truck. it will interfere with the SFA articulation when the amount of lift is minimal. then, you will have to weld in a straight crossmember to compensate for the weak point you just created.
other wise, yeah, you're going to need like 12'' of lift to clear the crossmember w/o worry of the possibility of clearance issues. fwiw, many of the guys running lots of SFA lift on a factory IFS truck cut the front crossmember out anyway, and reinforce the frame.
any less than 9'' of lift is not worth the hassle of a SAS to me, today's modern IFS systems can easily handle the stress of 35's, and even 37's offroad.
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