My cuda has a problem lurching /creeping forward occasionally when trans brake button is pushed.

1) fluid level ok, good color, no burnt smell.
2) I believe it has a griner brake after talking to Dave at pro trans.
3) Lupo converter, new

I have checked and replaced some of the wiring at the solenoid and have 12 volts. After a pass, sometimes the brake won’t hold the car at all. I have googled the hell out of this question, but most of the answers are power glide related. Car backs up fine and still shifts through all 3 gears normally. I have not pulled pan off yet. Any of you had this problem before?


Thanks