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Almost all the factory diesel trucks have 4.10's.The question is what gears do you have as stock? I know many of the diesels have higher avalible. I switched to 3.55 gears with my diesel swap. And run 315 tires. If I was in the mountains all the time at high altitude it might not be ideal. I'm in the flat lands and can run 80mph all day long with out the motor being wound up.