On my task to update my transmission guide with some missing information and correct some wrong data (still need to get that done) i figured out there was a book called “Nissan Sports and Rallye Transmission Manual” from Nissan Japan. It contains a lot of background information (it’s not a service manual) about the optional Transmissions used in various Nissan / Datsun cars over the time, including the early and late 5-Speed transmissions used in the S30 Chassis. After unsuccessfully reaching out to a few people who did not want to share their knowledge, and after missing a Yahoo auction for an original printed version of it for just an…