If you’re right, and you probably are, (2 out of 3 doctors and all) I’ve been hosed. I was told it was an M21 by the guy I bought it from.
Sorry

Hope the wallet bite wasn't too horrendous! FWIW, it could still do what you want as far as driveability goes. If you want to know more on the specific transmission, how to ID, gear ratios and the like, post the question in the
Driveline Forum where we can break it down and/or point you to what you'd like to know.