Woody, I have purchased several transmissions " off the floor" where I couldn't test them and have been very lucky.
If the transmission is being sold as in excellent condition, I would not purchase it unless it came with a written money back guarantee.
A transmission is not that difficult to rebuild if you have the book on the unit. You will probably end up with a better transmission because you will install better quality parts than your regular transmission shop, and getting the unit done at a specialty shop will be expensive.
I would suggest that you use a synthetic fluid for your tranny, whether you rebuild or not. It will shift smoother and run cooler. I have been using Amsoil fluids for 28 years, and have always had excellent results.
Bob
