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Re: Origin of the "Heavy" Half-Ton?
per '71 TruckService manual...RPO G50 increased rear axle capacity from 2500 to 3221 lbs. RPO G50 also included H78-15B upgrade from G78-15B tires.
(RPO = Regular Production Option; if I recall correctly )
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).
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