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Shifting at max line is good for the clutches, but not always good for the shafting, and other torque transfering parts. You have shock loading going on, which is the worst kind. Also, moving the shift lines from what is calibrated in there is not a good thing on the stock or mildly modded engine. The people that calibrated those lines are professionals, and those lines are where they are for a reason, not just transmission durrability but also engine durability and performance and fuel economy.
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