I have the Lucas transmission fix in my '99 Dakota. My transmission was starting to slip real bad, so in a last ditch effort, I tried the Lucas product. I figured "What the h#ll"?
That was 17 months and 15,000 miles ago! My transmission shifts just like new, and it hasn't slipped yet, not once. I don't know how, what, or why it works, it just works. I'm sure some day I'll have to rebuild my transmission, but at least I'm postponing it as long as possible.