I have heard conflicting stories on Lucas. But no amount of additives can magically fix a transmission.
The only way to get the transmission "inspected" , and I mean the "full cavity search" type, is to get it rebuilt. Seriously. At least in my area, a trans shop will tear down and inspect all hard parts for free. But they figure that since the trans is torn down, you are going to have to pay to put it all back together, so that is where they get ya.
What is it doing...or not doing??