2003: Tranny started losing fluid and smoking when it got low. I couldn't drive 20 miles without losing so much fluid that it smoked. Even got pulled over by a State Trooper once 'cuz it was smoking trying to nurse it home (very rural area, no place to stop and pick up a quart or two to get it home).
Bought a large bottle of Lucas Auto Transmission stop leak, filled the tranny with it and drove it 4 more years, no more smoking, no more leaking, and shifting as smooth as the day I got it. The stuff is gold.
Worked in my Ford C-4 also.