If transmission fix in a can really worked, transmission shops would not be in business. Never put this stuff in your transmission PERIOD. Most transmission problems could have been prevented by flushing/replacing your fluid every year.

Spend the 100 bucks for a good hot flush and filter change. Just dumping the pan only replaces 3-4 quarts, the average automatic holds anywhere from 10 to 15 quarts (depending on the size of the case and converter). You need to get that converter flushed out, only a hot flush is going to do that.

Everybody changes their oil, hardly anyone even looks at their transmission. That can be a very expensive mistake.