Servo = Sonnax 2-4 full servo kit..both pieces, 10 o-rings, the best there is.
get Steel pressure plates to replace aluminums if that's what is in there now.
Sonnax 0.500 pressure valve in the pump.
Transgo kits are good. investigate various versions.
Watch the series of videos on TransmissionBench.com... very good coverage.. I set up my phone on a stand while reassembling so I could review each chapter while putting it back together.
Inspect EACH part very carefully when disassembling. If any doubt about integrity, get a new one, particularly your planetary gears. (ask me how I know)
Watch as many YouTubes as you can on the subject, too.
I have three chapters on my website that address the rebuilding of my 700R4, which, when it comes to the drivetrain, is pretty much identical to a 4L60E (but not the controls). . scroll down to appropriate gallery, this is the home page..Good LUCK !
Check out how to build a classic 1949 Ford street rod with modern features and power and convenience you never thought possible. With a 383 SBC Stroker engine, S-10 front frame, Jaguar XJS/XJ6 rear end, air conditioned, power brakes, and power steering.