It is my understanding that the cab, doors and hoods are the same. Inside the cab probably the only difference is the height of the transmission hump since the transmission is several inches lower in a big bolt, making a floormat impossible to find.
If you need any measurements of the 4000 let me know, it's sitting in the driveway.
Last edited by ScottGMC40001964; 12/08/2014 10:28 PM.