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i know with the gm trucks its just grounding one wire and then you have tow haul mode. one my friends silverado i noticed the tow/haul tables had slightly more pressure then normal trans pressure tables, i just upped them to his liking. if it were me id copy over the stock trans pressure tables and start increasing them till you like the way it shifts with performance mode of course. this is with HPT by the way.
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1999 Alero 3400
Just hit 210,000 miles bisches 
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