I agree with Deanyel: If the transmission is only leaking a bit--not slipping or failing--I would give the Lucas a try. I don't have the tools or expertise to pull and reseal a transmission, not to mention set it back up to where it shifts at the correct points. My transmission has been leaking for over a year, but transmission fluid is less than $4.00 per quart. As long as it's only a slow leak, I will continue to throw a quart in every 1,000 miles.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles