Ive got a loose converter and when I'm accelerating with mid to moderate throttle the trans will go through the gears and ride 5th out to 80 mph without the converter locked. Light throttle it does great and wot it does great its just mid throttle. My trans tune downshifts from 6th to 5th with very little throttle input so I can pass without blacking out the road, I have an S475 charger. My thoughts were if I was to make the same changes on the 5-4 downshift it would hold 4th gear under mid throttle situations until the converter locks at 52 mph and I wouldnt have that blowing through the convrter feeling. Im pretty sure this wold work if I use the tap shift function and set it on 4 and manually upshift at around 55 the truck pulls harder with way less throttle input and the converter will lock under moderate to heavy throttle input in 4th. From what I understand there were adjustments made by my tuner on the 6-5 that reduced the % of throttle required to make the downshift. He would adjust the tune more for me but I have a feeling this is something thats going to take some trial and error to fine tune. So I you guys could give me a brief description on how to make the changes needed I would appreciate it. I already know how to pull up my trans tune and find the table for the 5-4 part throttle downshift just dont know how to make the changes. I've never tuned before, calibrating my speedo is the extent of my expertice LOL! Thanks!