I think the idea was to find disc brake hubs, etc., for the front and swap them out, C-30's will probably be smaller, so, get your dimensions, then go searching. P3500's(baby school bus, etc.) came with solid and IFS front axles, so, an IFS front might be an option.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.