Carl - I can't ever recall seeing any "2 piece brake rod" setups on AD series trucks, so thought I would do a deeper dive into a couple of pre-1954 Chevy Master Parts Books to settle my curiosity.
I agree with you that the 1947-54 FAM often omits earlier 1947-53 parts/designs, which can lead to frustration sometimes when trying to figure out what's right or not for the earlier trucks. I go to the Master Parts books to try and sort those out as best I can.
Pics below (titled according to the original books the info came from) indicate almost every AD series trucks, with the exception of 1948-53 DUBL-DUTI and 1951-53 COEs (which did use 2 different rods per the application listings), used the one piece "TYPE A" rod. There were differences in lengths for 1/2 ton & 1 ton (which used the same length oddly) and 3/4 ton, but the same one piece design overall. Not sure if there is any difference between Chevy and GMC AD series on these parts as I didn't try and track down any GMC specific resources to verify that or not.
Anyhow, back to trying to help Joe resolve his problem.
