Need help on NP205 Lubrication

[70Chevy4x4Nut]

I'm working on a 70 chevy 4x4 1/2 ton. It had a 3 speed manual with a NP205. I am going to go back automatic so I acquired a TH350 and NP205 from a 71 blazer.

I drained the oil from the NP205 that is with the Automatic transmission and it is Automatic transmission fluid and the other NP205 has gear oil. Which one is correct or are they both correct?

It seems like the bearings in the adapter for the TH350/NP205 are lubricated from the transmission, but I thought the NP205 itself would be sealed off from the tranny and take gear oil. Does anyone know what I need to put back in the NP205 when I go back with? I thought that ATF would be too thin an oil for lubricating the NP205.

Thanks