Persistant Trans leak

2000 Chrysler T&C has been in the shop once a year for the past 4 years with the same problem. The transmission or lines or something is leaking. Dealer cant seem to fix problem. He replaced the radiator the first year and id didnt fix the prob. When car went out of warranty in 2004 due to high milage he wanted to charge me to fix the same problem he couldnt fix three times before. He can get it to stop for about a year then it comes back. I had to partially pay to have it fixed the last time (1 year ago) and had to argue with Chrysler headquatrers over it. Now, just like clock work, it is leaking again, and the dealer told me last time he guaranteed it would never leak again? lost my confidence in this dealership.

Any one have similiar leak prob? how did you fix it?

TIA