I am working on a 67 Firebird that has had an LS3 and 4L60e swapped in to it. It came to me for some transmission shift point tuning. Upon first test drive, shift points were all very early and no TCC apply. I got all the shift points feeling good, but cannot get the TCC to lock on it's own. I can lock it with the bi-directional controls on the scan tool. I have traced wiring, including the brake switch input, all OK. I compared scan tool data with an older vehicle with a functioning system, the TCC status never changes states, always says OFF. I looked at the OS and I can't find any information on it, it is a T42 controller with OS 24252956. Attached is Rusty 67 Firebird-15.hptthe tune, am I missing something?