Hello guys

I am wondering if you can make the TTC lock up in 4th gear with TPS at 25% or more at 1500 rpms?

I have a 08 68RFE so I have to use HP Tuner. lowest I can get the TCC to lock up is 1500 rpm at 15% TPS, 1800 rpm at 20% TPS and then 2100 rpm at 25% or more TPS.

Just wondering if EFI can get lower then that or is that some sort of limits that can not be changed.

Thanks
Wes