Keep in mind, it's the overall tire diameter that matters, not the actual gear ratio. If your truck had 235/85-16, that's 31.7", 245/75-16 is 30.5", and 215/85-16 is 30.4". You will not be able to match that diameter and fit a tire in the wheelwell, so some programming is inevitable. A 235/70-15 is still only 28" in diameter. The bigger issue is the weight in front. You way want to step up to 5662 or 5664 coils, used in the convertible F-body.I will have to change the rear gears to 4:11 since that's what the truck had however with the different tire size I might go with 3:73
Such as pinion gears. With the mods you're talking about, you might be one of the few in actual need of a Ford 9".Oh and I probably should mention the engine isn't exactly stock, its got the obvious cold air intake, Marine injectors, #9 resistor for fuel delivery, turbo master boost control so I can turn the boost up higher, and an aftermarket chip in the ecm. Something else I know im forgetting
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