I had my 4L60 built to handle more power and one of the improvements they did was to add a shift kit and increase the line pressure. I have read that when you have a built tranny you should zero out the adaptives and a buddy who has been tuning for years tells me that if I don't the tranny will not last because the shift kit it trying to shift fast and firm but the pcm is trying to stop it from doing so.
My question is do I have to remove the TM or is it just better to do so?
I had not done so yet because it was shifting really firm already. It would squeal the tires in the 1-2 shift at part throttle and I did not want it any firmer. But I recently put in a higher stall tq converter and now it is not so firm so I was thinking of reducing the TM a little. Mt thoughts were to lower the numbers in the "normal" mode and zero them out in the "performance" mode so that when I hit the tow/haul mode at the track it would shift faster and firmer.