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4L80E Kickdown Problem Donald 1-13-11  
I have a '97 motorhome with a 4L80E and 454 vortec chevy. The problem is extremely premature downshifts. The tranny always downshifts at less than 50% throttle. I have no codes and the TSP and speed sensor are both correct. The previous owner had installed a Banks system and I wonder if that could cause issues. Anyone had this problem or advise as to a course of action.
Re: 4L80E Kickdown Problem Larry 8-21-11  
I have a 2000 454 4L80E down shift from OD will not go back to OD. They say torq. conv. & shift solnoids. I have banks exhaust syst. What did you end up doing to fix.
Thanks.
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