Originally the 37 pickup had a completely different clutch design with a different fork and graphite throw out bearing compared to post 1940 trucks. The attached picture is the end of the clutch pedal. The clutch fork has a round rod going through the smaller hole at the end, held in place by clips or cotter keys. The large hole is for the pedal bracket shaft.There is no hook or chain. The clutch free play is adjusted by setting the adjusting bolt shown in the picture. Over time different parts may have been substituted, of course so I don't know what the OP started with. The original 37 bellhousing puts the clutch fork ball closer to the axis of the driveline by about 1/2 inch, compared to later bellhousings. The stomp starter is also designed differently so using a later engine with the later clutch is problematic. My truck has a 40 216 with the later clutch design, so we had to shorten the fork by cutting and rewelding to keep the original clutch pedal and stomp starter.
