904

A-904

the A-904 is a member of the torqueflite transmission family. The A-904 was a scaled-down, aluminum-cased version; smaller and lighter, it was quite capable of dealing with the power of the slant six and 273 V8 (later, the 318). The difference between the 904, 998/999, and 727 was largely in the materials and the amount of 'beef' because of this Base models tended to get the A-904. the 904 and 727 tend to get confused, Much of this confusion probably stems from Chrysler's early general-public references to the 904 as "Torqueflite 6" and whichever Torqueflite was behind V8s at the time as "Torqueflite 8." A V8 version of the 904 did not appear until 1964, when it came out behind the 273. (And there was a slant-six version of the 727 for truck use.).

AMC used Torqueflite automatics, both the 727 and 904, in altered cases to match their individual vehicles (where they were called Torque-Command). Case size, length, driveshaft yoke, and other external parts differ based on their applications.

sources

www.allpar.com