[DieselSJ]

Originally Posted by 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.

Call California Performance Transmission in So Cal (Huntington Beach IIRC). That is where Art Carr opened shop after he sold the "Art Carr" business years ago. He is the one that taught me to run it through the external cooler first. You need the fluid hot enough to flow properly and to boil off any moisture that accumulates.