[Bigdav160]

So can anyone post up some credible evidence that overcooling a transmission is a bad thing?

I've found some information that ATF at very low temperatures (below freezing) does not lubricate well. Although I don't think auto transmissions, compared to engines, have similar lubrication needs so it may not be important.

Certainly overheated ATF looses it's ability to lubricate. I've seen many examples in my transmission career.