I got this old chevy out of a junk yard. I am trying to determine the factory model designation of this truck. the plate above the windshield indicates a shipping date of 1-10-41. and the second and third digits in the vin are YP. It has a winch and dump body. it has an original dump bed, but i'm not 100 per cent sure it was on this truck when it rolled off the line, because there is no separate lever on the floor to control the hoist, but instead a pto cable mounted through the dash. also the control lever instruction plate above the windshield doesn't show a dump control lever. Regardless, after some looking on the web, a "book symbol " NL designates a model G7116 which was a" dump with winch." Does anyone know what "YP" stood for? The closest thing i saw was a "ZP" which designates a model G4163 which was a "truck cargo with winch ." So - my question is - what model designation does "YP" stand for? Thanks .