AMC and Chrysler 727 auto trans ?

I am new to AMC torque command tranmissions and AMC engines.It is my understanding that the 727 and 904 transmissions are the same as Chrysler Torqueflite units of the same model. That sounds too simple for this old man. I have a fresh shop rebuilt 401cid to replace the deceased 304cid in my new old 73 Javelin. the 904 trans of course does not bolt up to the 401. So, I am looking for an AMC 727 and there are none to be found within a considerable distance of home. I can find rebuilt Chrysler 727s in the catalogs of a couple reputable National parts vendors I have done a lot of business with. My question to this forum is will a Chrysler 727 torqueflite of similar vintage bolt up properly to a what appears to be a 1975 AMC 401 engine. Thank you for advice and suggestions in advance.

The 904 trans weighs 25 lbs less than the 727. The 904 has a 2.74 first gear and a 1.54 second gear. 727 has a 2.45 first gear and a 1.45 second gear. The 727 is also appx 4 inch's longer than the 904. Also the 727 has a larger output shaft so the 904 yolk will not fit a 727. Any good shop that builds transmissions can set up the band adjustments and check valves for correct line pressure on the bench before the unit is installed in the car. Most overlooked is the kickdown linkage adjustment. If not set up correctly, the trans will not shift properly and you will burn up the bands. A well built 904 will easily hold 450 + horsepower. 

ADAM12MATADOR wrote: The 904 trans weighs 25 lbs less than the 727. The 904 has a 2.74 first gear and a 1.54 second gear. 727 has a 2.45 first gear and a 1.45 second gear. The 727 is also appx 4 inch's longer than the 904. Also the 727 has a larger output shaft so the 904 yolk will not fit a 727. Any good shop that builds transmissions can set up the band adjustments and check valves for correct line pressure on the bench before the unit is installed in the car. Most overlooked is the kickdown linkage adjustment. If not set up correctly, the trans will not shift properly and you will burn up the bands. A well built 904 will easily hold 450 + horsepower.

A 904 has a 2.45 low
A 998 has a 2.74 low
A 727 and 904 use the same valve body, same line pressure.

Just to make sure I have this right: A Chrysler 904 is a bolt on to the AMC 401 engine. Any idea what vintage 904 transmission is correct? Thank you for the lead.