For the SOHC D series all you need is the Factory Service Manual and me. I'm also a dealer for Synchrotech but you are already in Cali. Just contact James or Dave.
The casting codes, aka P20/A000 or P20/B000 are something I figured out and the info has been shared GREATLY for 15+ years.
Likely you won't need a whole rebuild kit. ISB + seals then other parts as needed.
I would suggest a look at the Transmission Forum and the stickys/FAQ on
D-Series.org - Your Ultimate D-Series Resource for more info.
Aquafina and I have walked many through a rebuild over the web.