03Quadrado

Ive had hptuners now for a few years but cant figure out how to get my 4l80e to downshift at higher vehicle speeds, (ie plus 12mph). Ive got the upshifts perfectly dialed in. Now i want to get my truck to downshift automatically. I would like 4th gear to stay engaged no lower than say 33mph. In other words if i lift my foot i want it to go into 3rd gear below 33mph, always. I want to work this with all the gears. I cant seem to make it work. Can it even be done?? Please help.