I wonder if it isn't the M22 Muncie GM-made 4-speed transmission? There actually was a 3-speed version, which was the M12...it was the base transmission in early (65-ish) GTOs. Original Message: ----------------- From: Jon Pierracos Jon53@xxxxxxxxxxxxx Date: Thu, 8 Dec 2005 14:06:51 -0600 To: mail@xxxxxxxxxxxx Subject: M-12 Quick question... An M-12 is an auto tranny right? I thought I saw a post last week calling a 4 speed an M-12. Jon 1970 AMX 390 M-12 Big Bad Blue with Blue Interior, AC, AM/FM & Go-Pac -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .