Not best, but optimum Transmission?

If you don't do freeway a lot I think you might stick with the 727.
Tis a sticky thing to consider. Every now and then I like to drive it up to my Paw's house. 120 mile ride on the interstate. I keep it to 60 mph (3,000 rpm). It still feels like I'm abusing it. I would just like it to feel more comfortable under all conditions.

Out of curiousity, what is the fluid level at? The trans in my Dakota would slip into neutral when the fluid was low. I had a rusted out pan. Be the first thing I check. I don't know on the rattling though.
Good question. I checked it just a few days ago when I rolled back into the driveway. It was about 20% down from the top line. I replaced the pan and pan gasket last year. And the fluid is as pretty and healthy as a horse.

If you are'nt handy with the tools on the more delicate stuff like trannies, then if I were you, I'd look at your pocketbook, decide how much you can throw at it. Then call A&A or Cope and tell them you want to spend X amount of dollars on the most bada** trans they can build you. You don't have to tell them how much $$, but I would start a conversation with them about what you desire and see if it works into your budget. I'd lean towards sticking with the 727 myself.....you can do a lot with them.
Lefty - I'm good with my hands, if I have the right tools. A) I don't have the right tools for a trans, and B) I know very little about a trans. Really considering taking a class specifically about automatic transmissions this summer at the local tech college. But even at that, I just have a normal house and garage. No lift. Pulling and replacing would be VERY difficult for me. I happen to have a few dollars available to waste on this kind of crap, so I'll take a look at A&A and Cope and see what's up with them.

My GWAD. At the risk of writing a book, I'll just say the most economical thing you can do is stick with what you have, even if it means having it completely overhauled. As long as you don't "need" an overdrive, you HAVE the best three speed transmission on the planet.
RRR - That makes TONS of sense. Maybe too much sense. I dream (and will start to put my dream in motion) of building a very nice engine on the side. So I can keep chugging along with the 360. Then when I have my dream engine built, swap it. Would want to have an ideal transmission ready to go at the same time. The 727 would be fine if I could turn 70 mph at say, 2,400 - 2,500 rpm. In the end, it's likely I'll just live with it.