Low end '56 Pontiac and Olds used the older dual-range HydraMatics while upper end models used the newer dual coupling HydraMatic. Pontiac named it "Strato-Flight". Olds and Cadillac had different names.
The "56-28" models are the Pontiac Star Chief models. Document scanned from a '56 Dealer's handbook.
'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.
