Just bought a 52 Chevy 2 ton 6500. Flat bed, dump bed. Runs and drives great, everything's there. Top speed is around 50, would like to get that up. Doubt we'll ever haul much with it, so that's not a big concern. I would like to shorten and narrow the aftermarket flat bed, maybe even go to single wheel rear end instead of duallies.

What are the easiest changes for speed? Tranny (currently 4 speed with 2 speed axle) or rear end? I'd like to keep the stock wheels.

I'm a novice mechanic, so the simpler the better.

Thanks!