Having an issue with getting my speedometer to read on the HP Tuners scan. Swapped a 4L60 to 4L80. Got the conversion harness and trying to go into do a scan and have the MPH show 0. Transmission shifts like crap. Is there an option in Transmission in General to select 4L80? All I see is Auto or Manual in that tab. If we use the old 4L80E TCM that was flashed supposedly by a company online, it will show 0mph. If we plug in the new TCM we just received that is not flashed yet, it will show MPH. What is the issue?
I have attached the tune files to hopefully see if anyone can help understand what is going on or what to do.
Thank you.