I have the same casting number on my 4 speed in my '48 3/4T. I know the engine wasn't original but I suspect the transmission is. I don't know about casting date numbers on transmissions but I have "01 8" above the 591665. Jan. '48???


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.