Converter Whine

Contact Edge. There's not a lot inside a converter that could cause a whine. About the only thing that could possibly whine, if they were put in, would be any Torrington bearings that might have been installed. It might also be a good idea to check the oil level in the transmission.
As far as the transmission cooler goes, get one installed. Smaller diameter converters will generate more heat than a normal converter, and don't cheap out on the cooler.
A good cooler is made by a company called Tru-Cool, it is a rad style cooler and one of the best. Keep it in the air flow by mounting it behind the grille. B & M sells them under their own brand name.