Also, FWIW I just referred another guy to the pirate4x4.com website, and he had a guy offer to trade him 4.10's for his deeper gears almost immediately. I would probably try there first; those guys actually want the deeper gears, where the truck guys pay/charge a premium for the taller ones.
Some of my crap:
1963 C-30 flatbed dually 292/SM420
1965 C-10 LWB fleet 250/column shift 3 speed
1965 C-30 9' stepside 250/SM420/4.10 gears (my DD)
Website I made for my crap:
http://www.66submarine.com 
