I don't have a 1972 Truck Data Book, but my 1971 book shows C-50 with the following GVW ratings;
15,000 gvw has 7.50 x 20 8 ply (front and rear) as "Standard".
19,500 gvw has 8.25 x 20 10 ply front, 8.25 x 20 12 ply rear; 8750 pound rear springs.
22,000 gvw has 8.25 x 20 10 ply front, 8.25 x 20 12 ply rear; 7,000 pound front axle with 3.500 pound springs; 10,400 pound rear springs; HD Frame for GVW.
24,000 gvw has 9.00 x 20 10 ply front, 9.00 x 20 12 ply rear; 7,000 pound front axle with 3.500 pound springs; 17,000 pound rear axle; 10,400 pound rear springs; HD Frame for GVW.
Note, the 17,000 pound rear was Cast Wheels only, so your 10 lug rear is only rated at 15,000 which lowers your max gvw to 22,000 if you meet all the other criteria.
Is this an Air Brake truck?
Mike B
