Nv3500

From Wiki:

Wide Ratio Gearing Option in Dodge 1500 & GM Full-size Light Trucks:
[1]---[2]---[3]---[4]---[5]---[R]
4.02-2.32-1.40-1.00-0.73--3.55


Close Ratio GM S/T Small Trucks[1] & 2500 Light Duty Dodge Ram Truck Gearing:
[1]---[2]---[3]---[4]---[5]---[R]
3.49-2.16-1.40-1.00-0.73--3.55

Now I'm wonderin' if he can buy an aftermarket close-ratio set... Doin some research as I'm curious as well.