it's 4000 series or 6400 series. most cab parts and engine parts will be the same as a 3100. fenders, grill, bumpers, wheels, rears, running boards,drive shaft, brake parts and springs will be different. since it was used in business the engine may not be original to the truck and you will have to go by that in ordering engine parts
Last edited by kb3csw; 01/20/2008 7:23 PM.
