To get back to the original question, I have a Trans-X success story:
Lost 4th gear....

Also, I think Trans-X is supposed to clean off the varnish, not make the old seals swell up? I didn't think it's to prevent leaks?...

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)