Just had my trans built to a level 5. Because I can feel 2-3 and 3-4 shifts It seemed I needed to change some shift points. I'd never tried the caculator so I did. It worked great. The only change to the calculated numbers that I made was to raise the converter unlock by 2 mph. With a cam 33mph was too low. It's terrific not to have to worry about all the relationships when setting shifts. Of course I'm probably the only one who never had tried it. If I'm not I highly recommend it.