T223 transfer case oil capacity??

[Cariboo4x4]

So last week had my buddy drain and refill this tcase. I told him 17 pumps on transfer pump was 1 liter. He lost count. Anyone know or have a book with oil capacity for it? I think possibly 5 liters? We put the 80/90W GL5 gear oil in it. I need to charge the owner for the gear oil so dont want to overcharge. Thank you in advance. Its in a 1977 International Loadstar 17004x4
 

[DoubleO7]

 

[Cariboo4x4]

Yes. I cannot find a spec on how much gear oil it uses. It has a fill hole Which tells you when its full. Nearly all my other manuals tell me capacity or amount of oil a diff or transfer case uses etc.
 

[DoubleO7]

2.5 litres

Rockwell lubrication guide pdf
Maintenance Manual No. 1
Page 44

https://www.google.com/url?q=http://www.numeralkod.com/cross/archivemanuals/meritor-rockwell/lubrication.pdf&sa=U&ved=2ahUKEwjM29vn45LuAhUEpFkKHTTCAzcQFjACegQICBAB&usg=AOvVaw2JYwcANA9tcFF17yPRLwna
 

[Cariboo4x4]

[Cariboo4x4]

The parts guys here are mystified when I ask for 90W GL-1. They want to sell me the Universal Tractor Fluid that meets GL-1 spec yet its viscosity seems like water compared to 90W gear oil. I'm in BC Canada so does someone here know what I can ask Napa for? 50W engine oil is something else I can use which may be easier to order in. Link above recommends 90W GL-1 or 50W motor oil
 

[Jim.ME]

This look right to you?