Trying to figure out why the truck wont shift if its held to the floor? I have used the Bluecat trans software to set the trans up. Its a built 4l80E with an FTI 3600 stall, AWD, 3.73 diffs, and 285/50/20 tires. If I hold it to the floor the truck will not shift, if I barely ease of the throttle it will shift. Ive played with the shift speeds and RPMs and still cant seem to get it right. I have went higher and lower but nothing drastic. I'm assuming this has something to do with the speed, but my speed is set fairly lower then what it actually shows on the scan so the speed flag should been met and just waiting for the RPM flag.

 

I use EFILive, and there are different areas to address. One area is partial throttle, and the other is wide opened throttle. Make sure you change the wide opened throttle. Both parameter's need to be met in order for it to shift. Speed and RPM. If you log, is it commanding a shift?

 

The shift points check out ok. 52/89/132 is correct based on your gears, tire size and transmission (80e).

I compared it to mine (same p59 controller) and the only difference I saw that could make a difference is the speedo calibration. Yours, when compared to mine is off.

See the attached screenshots. The first one is the difference and the second is my settings.