In 1937, Chevrolet made only one cab for their trucks. So, if you have a 37 cab, you have the right one. Chevrolet made two styles of front fenders, the 1/2 ton truck style and the 1 1/2 ton truck style. The easiest way to tell the fenders apart at a glance is that the 1/2 ton truck fenders had a "notch" in the front of the fender for the bumper bace to attach to the frame, a 1 1/2 ton (big) truck did not have a notch in the front of the fender for the bumper brace. The wheel openings in the fenders were larger for the 1 1/2 ton truck, but is not as quickly recognized as the fender "notches".
In 1936, Chevrolet made two cab styles, the high cab, which was more-or-less a carry over from the 1935 cab design. That cab was manufactured in the earlier part of the model year and in the second half of the model year, the 36 low cab design was introduced. The cab itself was looks just like a 1937 cab, but there are a few differences. The 1936 cab windshield has a slightly different shaped windshield and there was some wood bracing under the dash of the 36 low cab truck. In 37, the line of the windshield was smoothed out and all the wood was removed from the cab.
In addition, the 36 grill and fenders are quite a bit different from the 37. 37 was the first year for the "fat fender" look and a bold, advanced design - the radiator cap was under the hood.
1937 1/2 ton fenders and 3/4 ton fenders are the same.
Hope this helps!
Joe
