shift kit necessary?
Plus nearly all tuners offer to do this, if it led to widespead cases of trans failure I don't think you would be seeing this.
You should be sure of what you are doing (i.e. not just changing things without knowing what they do) but if you are knowledgeable about it you should be ok. I did this on both my previous cars and had no trans issues.
I would still agree though that a shift kit is probably a more reliable way to accomplish this.




