If you don't have a clutch pack compressor you'll need at least two 5" or 6" c-clamps. There awkward but they work.
Some good snap ring pliers.
A good set of bushing drivers are very important. And test fit after every bushing install.
You'll need a little piano wire crimped on a little tube or a .010" feeler gauge with the edges rounded to work the piston seals into the bores.
A caliper or dial indicator or feeler gauges to measure endplay and clearances and such.
An inch pound torque wrench for the valve body and a ft-lb unit for the center support bolt.
An air compressor.
Some dental picks and stuff.
A good trans parts shop (you will make more than one or two trips to get parts). You could order them but it will be annoying when you need a $2 part and that happens three different times.
Lots of brake cleaner for the hard parts.
I am sure I forgot something.
I used this book... "
How to Work with and Modify the Turbo Hydra-Matic 400 Transmission (Motorbooks Workshop) (Paperback) by Ron Sessions"
The book has everything you need to know and explains what tools you can work around and what you can't. I would buy the book first. Read the necessary tools chapter, and the rebuild chapter (or the whole thing if possible), and then decide if you have the equipment and place to do it. An auto trans is the only thing I have ever had to buy a book just to put it back together. I took one apart once without the book and all these bearings and wear plates and everything fell out and you're thinking, "uh, where did that fall from?". And I went to put it together I couldn't get the planetaries in far enough to get the center support in all the way. Turns out it's very simple if you just know what order to put the "assemblies" back together. Then the little torrington bearing doens't fall out of place from inside and prevent you from getting it all the way back together. If you read the book it goes together no problem.
Oh, one other thing, you will need patience.
