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i'm buying a 01 ext cab, 4wd truck, it has 4 1/2 inch banks exhaust and a power tuner that you hook in thru the obd port. This guy showed me the different settings where you are adding horse power, 30 when towing something real big, 70 when towing 2000 lbs and 90 when not towing anything. how much extra power will the transmission take with out harming it, or what does the trans need to handle more power. any other words of wisdom would be appricatied