shift chip?

[NE98LS1]

so one of the guys i went to HS with is now a certified mechanic and has an IROC with the 4l603 trani, and hes gonna do an install of a higher stall TC, and he thinks they make a chip that works just as well for my trani since mine is electronic, anyone know of this chip and how well it works? cost? otherwise we'll just put a standard shift kit in it. thanks!

[mrr23]

well, there is no 'chip' to put in. you have to reprogram the PCM. by reprogramming the PCM, you can change the shift points and firm up the shifts.