Justin,
My '37 half ton project came with a 4 spd in it, an option for that year. You can make it work with the correct u joint assembly.

My '42 half ton has the same 4 spd in it and I blew the u joint, tearing up the yoke that attaches to the output shaft of the tranny. I had a heck of a time finding a u joint assembly for that application and during the process inadvertently bought a u joint that fit the 3 spd. The out put shafts are different as the 4 spd has a larger beefier diameter. I am guessing it will be the same for your situation.

Look at Keith Hardy's Old Chevy Manual site, find the correct u joint part number and keep checking Ebay or your other sources for old parts. I think you will find one eventually.

Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix