Technical Ford Courier Sedan Diff Oil.

My T coupe has a '55 Courier Sedan rear axle and I'd like to fill it with fresh diff oil. I can't find any spec online so could anyone help me out with the correct type please? Thank you.

 

Look for 75-90 wt. Hypoid gear oil, GL-4/5 should be fine. If container says Synchromesh it is for transmission, Hypoid is for rear axle.

 

Thanks very much for your help Jagmech!