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The Race transmission strategies will have a faster and firmer shift speed. This will in no way harm your transmission if you use this for daily driving. It will, however cause axle wrap on the rear end and you may get a double shift feeling. Where it will hit hard twice in a few gears when a load is on it. Ladder bars will take care of this issue.
With the firm transmission files, the trans will slip between the gears to absorb the torque slowly, so that it does not bang into the next gear. This does leave room for error, however, as it can slip too much, rev up, and bang the next gear anyways.
The transmission shifting in these trucks is very delicate, and with the addition of 275 horsepower, it is very difficult to get 100% perfect shifting. Look at it this way, the factory is tuning a trans to shift while applying from 0HP to 300HP at the wheels. Now we have to go in and adapt those same shift strategies to manage from 0HP to nearly 600HP at the wheels.
All in all you if you want the best shifting (even on a stock truck) put ladder bars on and run race shifting.