When did chrysler use a removable bell on an automatic

The cars that had the cast iron PF & TF [ 1961 was the was the last year ] had studs coming out of the c'ter that bolted to the crank flange, nuts put on from the engine side of the flange. There a short coupling with sealing rings on it that coupled the c'ter hydraulically to the front pump. You can imagine how precise the machining would need to be for everything to match up...
The windowed bell housing openings were used with the PF, the c'ter was air cooled hence the openings. C'ter had external fins to generate air flow.