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The SCT recalibrates shift poiints! I have the SCT Xcalibrator 2 from Innovative Diesel. I just got it today. I have had a meriad of other tuners on my vehicles in the past. I found SCT for my Lightning a few years ago... I haven't used anything else since! I have not found a better tuner that is CUSTOM to each spec. (Including any other mods you have for your truck!).
You have to realize that there are very few tuners that sell SCT on this site. Other sites have more info on the FULL array of tuners available. It is a big investment, do your homework BEFORE you buy! You will be glad you did!
SCT and Superchips both run the shifting up past 4,000 RPM.
These are the ONLY two companies doing this.
Others can adjust firmness, but no one else is really screwing with shift points and t/c lockup.