4L80E Trans Shifiting Questions.
09-09-2012, 05:23 PM
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4L80E Trans Shifiting Questions. My brother has a 2006 Chevy 2500HD with 6.0. He had a superchips tuner on it for years but mileage suffered. I finally talked him to letting me tune with HPTuners, so far mileage has gone up and performance is actually better. He really liked how hard the trans shifted. I been trying to get it to shift like the superchips tuner but need some help. Here is the file, if so one can help that be great thanks.
