It's a ZF AK4 S20 with "Ferngang" overdrive. You do need to hope that you don't need parts. I doubt you would find any. I would not take it apart if you don't have to. A few years back I did a ZF from a 230, essentially the same design and it was a difficult job. It did have a lot of problems and came to me apart, so that was a factor. Fortunately I had other transmissions to disassemble, compare and take parts from.
