I've been messing with the tranny shifts on my 2012 GMC Denali Pickup for some time now and got everything feeling real good except the peak of the 1-2 shift. I took out around 20% of the shift times and added about 20% pressure along with little a few other things. The peak 1-2 shift just isn't smooth and fast like the others are. What am I doing wrong? Here is my modified tune along with my stock tune. Also there were no modifications done on the pickup so the tune should be dialed in perfect(factory).
Peak 1-2 Shift
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NEW!!!
I will make one calibration change for an additional $100 per change. For example, changing a shift point for a given gear is $100 vs changing a shift point and a pressure setting would be $200. That value can be used towards the full custom tuning price.
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