I've been working on a friends suburban and I've got just about everything working like it should except I want to soften the 1-2 shift at light loads. He had the trans built way beyond what a suburban should need and it shifts hard 1-2..

What is the easiest place to alter this?? desired shift time vs tps?

If so I've posted the stock table as a jpg if you guys could make suggestions that would be great.. I've never messed with trans tuning.