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dragonmaster1369, Running these old trucks at more than 60 mph without modification is asking for trouble. To achive highway speeds, adding taller tires, an overdrive trans, or changing the axle ratio is the only way to get to get the engine RPM's low enough to avoid damage. The 4.56 gear...

If the engine hunts or surges under load, there may be water in the fuel. When you change the fuel filter, check the old one for water contamination.