Does anyone know if the 6R80 and/or 6F55 is physically capable of locking the torque converter clutch in 2nd gear? I figure there is a reason why the factory never programmed either gear in either transmission for TCC Lockup in 1st or 2nd gear. I know there was a physical limitation for 1st gear TCC Lockup with the 4Rxxxx transmissions.
Any ideas?