P1740 code on 02 ram, help?

I've been looking up some p1740 fixes on YouTube, and I'm struck by how vague and nebulous this code is. It seems as though there are many, many "fixes" for this. Some are very invasive into the trans, with limited success. In some instances, it has been remedied with seemingly unrelated (to me, anyway) small part replacements. I guess I'll start with a fluid and filter change, and go from there. Because of the mileage, it's due for that, anyway. Thanks for the suggestions, keep them coming.