I am considering installing 373 gears in my 2004 automatic 4.6.i have to get a tune to calibrate my speedometer. my concern is my shift points are going to get firmer like installing an aftermarket shift kit. for casual driving when it shifts, will the shifts be overly aggressive or only when I really get on it? I was told it would get really annoying after a while. anybody have any thoughts or any experience with the shift points after having it tuned with an automatic?

thanks.