10 speed is great to find that perfect rpm zone. My 3.15 does pretty dang good, no complaints in the power. The truck is light so getting the wdh perfect takes some trial and error.Go with the payload package if you can find it. My 18 tows my 32’ 8,000lb dry tt just fine up a 6% grade in 113 degree heat. The 10 speed seemed excessive until I put some weight on the truck. Never hunts never screams to provide power. It might downshift once and pull like a freight train...
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Thanks!Turbos react to engine load. In a higher gear, there is more load on the engine and you'll produce more boost. Downshifting will use a mechanical advantage to make it "easier" for the engine. Reducing load and reducing the boost needed to complete the task.