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[quote=Humdingah]Actually going from a stock 35" tire with 4.10s to a 40" tire would require a 4.69 ratio to keep the stock ratio. Since they don't make a 4.69 you could use a 4.56 (shorter than stock) or a 4.88 (taller than stock). A 5.13 would be way taller than stock gearing...and crazy tall running 37"s.

I already had 4.56 gears in my truck when I bought it w stock wheels/tires. Maybe thats why I felt so much of a loss jumping up to 37's. I'm hoping w/ the extra torque I'll need less throttle which should keep it in overdrive more on the highway.