Transmission Part Identification

[lintcollector]

We're working on a 1972 C10, 402ci engine on a truck we bought that was already torn down.

We have this "bell" looking thing hanging off the transmission and I can't find an image to show me what it is, or where it should be connected.

The identified connector, in yellow below, is a few inches away from another pipe (red) that that looks like it connects into the engine block, or so my daughter/helper said. The red pipe runs perpendicular to the "bell" but starts at the same height. I can't find the connections on a 1970 we have in the backyard as reference, the bell thing is missing...

I'll try to get actual pics up when I get home, but I'm scratching my head on if that pipe should be connected to the yellow bell thing, I didn't think transmission fluid went up to the engine.

I borrowed this image from another post, so I can't take credit for how clean the tranny looks.

Thanks in advance!