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in my auto, it's an 03, which would b better to get? the jmod or a transgo shift kit? and another question, if i install either shift kit that i mentioned above, could i also tune the shift points even more wit a handheld tuner?
you cant tune a shift kit with a tuner. It will tell you in the instruction manual. You will mess the tranny up. I just used the supplied shift kit that my tuner has installed and it works fine. I had a shop tune each gear for best performance
I'd try the tuner first and adjust your line pressure and shift points. Then if you don't like that you can go the shift kit route. Why not start with the easiest way first?