When did chrysler use a removable bell on an automatic

Long story short my old man bought a bunch of junk b an rb engines.
One of them had an aluminum bell on it. When he pulled it off he realized it didnt have a spot for a clutch fork and there was a torque converter inside of it.
I know there were a handful of autos before the torqueflite but Im unaware of any automatic built to fit an rb.

Ill post pics as soon as my phone is charged.