Thanks for the reply
Part off the list is 4 317 rear bearing retainer
It is the same as civilian 1 and 1.5 ton enclosed shaft trucks from late 30's to 40's as David stated .Think they sourced a lot of running gear from civilian 1.5 ton for the cab 12 C8's
Any help greatly appreciated
A few more pics
Third shows where the bolt and bearing retainer let go and caved in and cracked cast housing for speedo drive gear. Hasnt left enough undamaged metal to ream and bush hole