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. Hi Nick, . No body is perfect. If the proof reader for the parts catalog rode the trolley to work, they wouldn't catch errors obvious to the mechanic. Pix #1 is cover of 1940 parts book. Pix #2 is first page of Martin-Parry floor pans used on Chevy commercial bodies. (Passenger used Fisher bodies in US.) Pix #3 is second page of listing. You can see where it lists "1937 - 38 ALL". . . As for the lump over the U-joint, I looked in a 4X4 parts book and found a photo of the floor with a forest of levers protruding forth. Pix #4 & #5. There was no obvious lump so I looked in the GMC 4X6 parts book. It uses a Clark 5-speed that is slightly taller than the Chevy 4 speed but not where the floor lump is located. Pix #6 shows there is no power take off nor transfer case excuse for the lump. . .
