I buy all my transmission parts from A&A Transmission in Camby, Indiana. Rick Allison is one of the best in the business and has manufactured many parts and upgrades for these. He will also generously share his knowledge and can put together a good rebuild kit for you. I like Turbo Action for torque converters. Paul Forte the owner there was working with Chrysler from the early days developing better converters for their race teams. No reason to go anywhere else.