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I dont think pushing tow/haul will cancel out any tuning. I do know that T/H has different separate shift schedule programming than your normal drive shift schedule. Did you tow with a 91 performance type tune and did hemifever tune your transmission shifts?
I'm on the other side with superchips 91 performance and trans tuning. I'm sure that my user part throttle shift schedule I created will tow much better than stock and stock T/H shift points. I also believe towing with my user created shifts holding on longer and tuned to 91 performance is superior to SCs tow tune. Tow tune tends to be boggy. Sorry I can't comment on Diablo tunes since I never experienced it.
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