http://www.gopnh.com/, They come highly recommended from some guys. I just had mine rebuilt and the builder who is well known for building heavy duty trans said save your money and buy a good reman and I would be good to go.
Gulf State park. We stayed there last Oct during fall break and we had a great time. If you dont want to make the trip in one day there is a really nice campground call South Montgomery campground. less than a mile off I-65. i think it was 21.00 for full hook up.