To start off, this is has to do with my experience with the 4l60e that has 180,000 miles in my 1500 4x4 Z71.
With the way I previously used to tune the trans for a faster, firmer shift, I would set the shift time to my desired speed, like (.250 sec) and then would adjust the shift pressure just by comfort feel. Or whatever felt like it worked with that shift time. Everything was fine, even when pulling a light load. But then one day I had to hook up to an all steel 18ft Car Trailer and loaded our rolling chassis hot rod project on it to take to the chassis shop. My worst nightmare had occurred. I experienced shift flare, and or, shift slipping with this amount of weight behind the truck. My first thought was its going out...
After some thinking and driving it easy, I thought to myself, GM sets the Shift time and Pressure to work in conjunction with each other. How about I go back stock, lower the Shift time by say 40% and then increase the pressure by 40%. With that adjustment, I did get the chance pull the same heavy load again, and have experience a pleasant shifting trans ever since.
So my reason for this post, am I right to go about that way of tuning from now on? I mean it works, but I thought my other way of tuning worked as well.
How do you guys adjust shift time and pressure?