My GMC '52 152 (3/4 ton like yours) came to me with a 1/2 ton front disk brake kit installed. The rotors and calipers were 5 lug from early '80s Chevy Monte Carlo. The PO's shop modified the spindles to use the kit's pieces by machining the spindles to the same size as 1/2 ton.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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