Freezerburn,
The first number is the "series" and the second number is the "wheel base" designation...
3100 = 1/2 ton
3600 = 3/4 ton
3700 = 3/4 ton Forward Control Chassis
3800 = 1 ton
3900 = 1 ton Forward Control Chassis
4100 = 1-1/2 ton 137" wb
4400 = 1-1/2 ton 161" wb
4500 = 1-1/2 ton 161" wb School Bus Flat Face Cowl
5100 = 2 ton COE 110" wb
5400 = 2 ton COE 134" wb
5700 = 2 ton COE 158" wb
6100 = 2 ton 137" wb
6400 = 2 ton 161" wb
6500 = 2 ton 179" wb
6800 = 2 ton 212" wb School Bus Flat Face Cowl
Happy Holidays!
Mike B
