HP Tuners like mentioned. I have it and in fact bought it just to change one parameter with my Performabuilt transmission that was causing it to go into limp mode. I’m average in the tech area ( I’m 64 so it’s expected) and I had no trouble figuring out HPT, copied my Blackbear Performance tune from my truck, transferred it to a laptop, looked up that function which was to throw a code or not throw a code for a 2-3 solenoid failure. My trans didn’t even use that solenoid according to my trans builder so I just told the tune to ignore that fault. I downloaded the new tune in my truck and my transmission was fixed.