Your friend is right. The reason is because the transmissions is going to elevate you transmissions line pressures. If when you had a computer tune they increased your line pressures, with a shift kit added it would have now been done twice. With the shift kit you will need to have the transmission line pressures returned to the factory settings in your tune. Most will have the torque management removed as well or at least most of it. Most tuners are well aware of how to do this so you will need to have that done before installing the kit. Good luck. Vince



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