What oil do I put in my road ranger transmission.?

Question

I have a 92 Ford l9000 with a 9 speed road ranger. What is the correct oil to use in that transmission. I am currently using 50w synthetic but it seems to get foamy. Thanks

Answer 1

Should find the answer here -  phone number at the bottom if you don't.

https://www.eaton.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/tcmt0021en-us.pdf

Answer 2

Mercon V...............

Answer 3

What does it say in the owners' manual?