Lowering a 1971 F-100, i think its impossible
I disagree with hpguy. I don't think that lowering a truck is such a bad idea, if you do it right. Lowering a truck lowers the center of gravity, thus improving handling. I think we all know how the old fords handle, especially at higher speeds.
Fordman_79
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79' F-100 390 4V C6 w/shift kit
79' F-150 Ranger XLT (project vehicle)