I installed the deep pan yesterday and took another look at the cooler line. It wasn't quite as sharply kinked as I originally thought -- in fact it wasn't kinked at all -- just a sharper bend than previously. I was careful to not overfill the fluid and took her for a test drive. Drove fine, shifted fine, no leaks after about 25 minutes of city driving.
Thanks for all that info. With what you've said in mind, I feel like I'd like to pull it out and rebuild it. It's not hard and I would have peace of mind knowing I freshened it up. Although, the valve body does intimidate me...
The car sat for 20 years before I bought it, and I have no idea how the previous owner cared for it.
You mentioned ATF+4? I'm guessing you prefer that over Type F? I've read of folks using Type F to help with firmer shifts, so I've been using that for a couple years. What are your thoughts?