TCI Transmission is bad

I have to admit that the A727 is intimidating to think about, but actually quite easy to work on once you get into it. I purchased a ProTrans unit for my 340, but didn't get it into the car for 10 years. Seals failed quickly, but it was easy to remove and replace all the seals. Broke a rear servo piston (common problem) and replaced it with a Sonnex part. I believe that Sonnex and Superior trans have good parts for the 727, and you can do all the work yourself. The only think that seems difficult to me is replacing the bushings. Inspection should cover it, but maybe purchasing a busing instillation tool is all you really need.
The valve body is also relatively simple to work on, but be careful to get all the check balls back in the right place or it won't shift correctly. Most shift kits do a good job. I would replace the main control valve with one that prevents fluid drainback in park. This is a good upgrade. It also allows total fluid flow in park, so you can check trans fluid level in park.

Good Luck
Bob