can a shift kit in the trans be used to firm up shifts be used with a programmer or chip that does the same thing

 

Do not use both as you run the risk of exploding the tranny. All you need is the Sonnax/Triculator kit and leave the Programmer alone. All of the programmers tell you to leve the tranny settings stock if you already have a tranny kit in- If you used both I believe the tranny would shift so hard that something would break for sure. I use the Predator tuner with the Sonnax kit and love it--