No one can help me...8L90 trans issues

[Jims72nova]

So my '72 Nova has been "done" for 2 years and I have had a transmission issue since day one. I installed a GM Performance connect & cruise LT4 & 8L90 transmission. The engine runs fine but the tranny sucks. I cannot get it programmed and regardless of what I do, where I go or who I talk to, no one can solve my issue. The problem is it does not shift correctly. It also has a loud noise that the guy at the transmission shop said last week it could be the torque convertor bearing. Anyhow, there are some error codes, specifically they relate to the solenoid data not being properly configured. I brought the car to 2 different performance shops and 2weeks ago, a GM dealership to program it. No luck. Finally last week I went to a local trans shop and he said "Vehicle would not take programming, but did take transmission TUN/characterization data. Vehicle drives similar to a trans in high line pressure all the time, Shifts happen at elevated RPMs & seem firm but trans is shifting without slipping." I don't know if a custom tune will help or not as I am completely frustrated with this trans. Any suggestions?

Here is a copy of the DTC codes I got from HP Tuners.

ECM: 7E8, CAN, ECM -EngineControl
VIN: 1G1YU2D67H5603214 - 2017 Chevrolet Corvette Z06 Premium 3LZ, 6.2 L, 8 Cyl
Serial: 111922421311VUCR
OS: 12678648
Calibration IDs: 12678648, 12690267, 12682045, 12667480, 12667843, 12680359, 12667871, 12679807
Calibration VNs: 0000EF73, 0000E38C, 000000A3, 0000F46E, 00003474, 0000EB4A, 00007D12, 00003E44
Basic PIDs: 50

Trouble Codes:
P0700 - Transmission Control System (MIL Request) (Current)
P0053 - HO2S Heater Resistance (Bank 1, Sensor 1) (Current)
P0059 - HO2S Heater Resistance (Bank 2, Sensor 1) (Current)
None: 7EA, CAN, TCM -TransmisCtrl
Serial: 7B19285E0M001781
OS: 24286913
Calibration IDs: 24286913, 24275012, 24287021, 24272181, 24274482, 24275013
Calibration VNs: 0000715F, 00002193, 0000DB9E, 000058BF, 00002833, 00001D85
Basic PIDs: 4
Trouble Codes:
P27A7 (Current) Solenoid Valve Characterization Reprogramming
P27A8 (Current) Solenoid Valve Characterization Reprogramming
P27A9 (Current) Solenoid Valve Characterization Reprogramming
P27AA (Current) Solenoid Valve Characterization Reprogramming
P27AB (Current) Solenoid Valve Characterization Reprogramming
P27AC (Current) Solenoid Valve Characterization Reprogramming
P27AD (Current) Solenoid Valve Characterization Reprogramming

Here is a video I did this past summer that you can clearly hear the trans noise and crazy shifting. You can hear it when I pull out of my driveway...
https://www.dropbox.com/s/3meyb1606n...drive.MOV?dl=0

I had posted a message in this forum about this problem and had several responses, none that helped.
https://forum.hptuners.com/showthrea...ght=jims72nova

Attached is the latest tune and log file.

At this point I am ready to get rid of the 8L90 and get a TCI 4 speed non computerized trans, I am just not sure what I would need to do to make that all happen. Also, is there a way to get a trans out of "high pressure"? (as stated above by the trans shop).

Thanks
Jim

7-6.hplNova Shift Schedule Changes KW MOD.hpt

[TheMechanic]

This may help
https://forum.hptuners.com/showthrea...-the-stock-one

https://forum.hptuners.com/attachmen...5&d=1556388232