The JC code would a '58-'62 235, standard engine for '58/
59 4000 and '60-'62 K10, K20, and C40, also with RPO 227 (
58-59) and RPO 223 ('60-'62) in 1/2 through 1 ton 2wd models. Both RPO codes are for HD clutch.


Bill Burmeister