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Who's gone for smaller gears???
I'm currently running 4.88's in a D80 rear in my 450. the plan is to bump them down to a 3.73 to gain some signifigant mileage and rpm range. i'm running the stock 19.5" rims, and my overall tire diameter is 32". at highway speeds, 65mph, the truck screams at 2500 rpms, +/-. I'm not hauling a whole lot, but my engine driven welder, tanks and tools are going to be on it, probably between 1500-1800 pounds.
anyone ever done a swap like this?
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