Inspection of a 904 torqueflite

The guy at the transmission shop said that a lot of the black fluid was probably coming from the reverse drum being so worn and it was possibly put on there too tight. Said it looks like a new reverse band from the rebuild but the drum was not replaced on the rebuild. I don’t know...... As I’ve not seen the reverse drum from another 999. I guess I’m just going to replace it. I have a measure that on both drums..