Tranny seems to be good rebuilt on the tranny about 2 years now...The problem is torque convertor seems not to be working right. I drive it about 10 min to the freeway hit around 45-50 TC locks up fine like normal, drive for a few more miles TC don't seem to be locking up anymore. I tried to tap on the brake to see maybe the switch is misadjusted but still don't lock up. Let the car sit for a few hours and drove it past 45-50 TC locks up fine. But then again same thing drive a few more miles same thing don't lock up anymore. Seems like if the tranny is cool it locks up fine.

I also droped the under dash piece and check for power at the brake switch and check mount and everything checks out good.

You think its a simple TC lock-up solinoid?