..the MX series does date to the early 50's. The medium case was used in the 55-66 Thunderbirds as well as other Fords. The small case went behind 6 cylinders and small V8s in the full size Fords and Mercuries. The large case went into the Lincolns as well as the 59-60 T-Bird with the 430 option. Prior to 1961 no vacuum modulator, this was added in 61. All are 3 speeds (take that Powerglide..) and all were sold at one time under the Ford-O-Matic or Cruise-O-Matic name. Based on the Borg-Warner design licensed to Ford, so yes, it is a kin to the awsome Rambler "Flash-O-Matic" Didn't you just love the way in the 60's car manufacturers had to add "O-Matic" to everything?!?!
Rick
