Spicer 7 speed ID

Hey guys,

Hope someone out there could help me out here. I'm looking for info on a Spicer 7 speed transmission (I think) model PS97 - 7A, in a 1991 International tractor model 800SER. It's behind (from what I've been told) a 300 Cummins. I am inheriting the responsibility of driving this thing and there are no maintenance records for anything. Specifically looking for what oil to use in the trans. Also, synchronized or not.

Thanks for any help.

Spicer 7 speed ID