I hear all the warnings, etc, and the last thing I want to do is break it permanently. BUT, I'm thinking it should be pretty straight forward to find out what the problem is, if done properly. It'* just a stupid car.
I'll do the TCC solenoid "click test" in the driveway. If no clicky, then maybe the show is over. Maybe not.
I'll then monitor the signals with a meter and maybe an led or two to see if the computer is trying to control it correctly. If there is no juice to the tranny connector, then there must be something like a brakelight switch problem or similar so I'll fix that and try again. Goal here is to be sure all wiring is good to the tranny.
Maybe the previous step will fix it...that would be great. But if not, I'll still want to know if TCC 'could' occur. So I'll warm her up, take her out on the highway, get up to cruising speed and ground the control line for a short amount of time, just long enough to see what happens. If this works, then I must have bought a bum computer off ebay (imagine that!). Anyway, that should finally and definitively answer whether lockup works or is broken. If it doesn't work, then obviously there is something more serious wrong and will then have to figure out whether or not to pull the tranny. But that'* down stream a little right now.
Thanks for all the feedback