OK, I understand what ratios do, but I'm wondering how much of a difference they would make in the real world. Say we've got two boxes, ratios of box 1 are 3.5, 2.1, 1.4, 1, 0.75. Box 2 has ratios of 3, 1.85, 1.3, 1, 0.75. We'll stick a 3.9 diff on, 7000 rpm redline and 195/70R14 tyres. Assume...