I want to interject a cautionary note here. Over the years, when old Advance Design trucks were retitled, the agency doing the titling would sometimes use the engine serial number instead of the truck serial number on the title. This becomes problematic if the engine is ever swapped out. In that case, you have a vehicle on which there is NO number matching the VIN on your title. Also, over the years, the serial number plate might disappear. Because of this, you may have a VIN on your title that doesn't match your serial number data plate or you may have a VIN that appears to be a correct truck serial number but you may not have a plate. In the latter case, many AD Truck vendors carry blank serial number plates on which you can stamp the correct serial number (so it matches your VIN.) In the former case, you are looking at a trip, or several trips, to the DMV to try to get your title changed to match the serial number.
Serial Number Location
Serial Number Composition
* 47-52 serial numbers on 1-1/2 and 2 Ton Heavy Duty Specials may contain an extra S character as part of the Series code. 47-52 Assembly Plant codes may be 1 or 2 characters. 47-52 Plant Production Numbers did not include leading zeros.
** Except 47-52 1-1/2 and 2 Ton Heavy Duty Trucks, which used Q, R, S, T, U, V to designate Year.
*** Partial List. It does not include C.O.E., Forward Control, or School Bus. 47-48 used Thriftmaster or Loadmaster rather than this Series designation or it was not well known, as indicated by a cross reference chart in the 48-51 Chevrolet Truck Shop Manual. The 6500 and 6500S were first listed in 51.
**** At least one document for 47 specifically
lists Van Nuys, CA and not Los Angeles as Assembly Plant location