Warren lists their GL5 as the first choice for the TYM 1054 front axle and their GL4 as second choice:
http://www.mag1lubeadvisor.com/
They don't show the 1104 model
here is the Amalie spec sheet for their gear oils. They say the GL5 is copper safe:
http://www.amalie.com/Gear-Oils/Amalie-Hypoid-Gear-Multi-Purpose-GL-5/products/files//7EF10E284EBF/Amalie_Gear_Oil_Spec_Sheets_2.pdf
I would find a cheap/easy local supply of GL5 and contact their tech line. That said, I have run GL5 in many transmissions with brass/bronze syncro mages and bushings with no issues
I have tried calling warren to speak with their tech line, but no answer yet. I will post once I hear.
https://www.tractorbynet.com/forums/threads/fyi-coastal-gear-oil-gl-5-and-yellow-metals.199042/
I would select and readily available oil near you and call their tech line
Gl4 is rated for boxes with yellow metal. I am told that all gl5 is safe for yellow metal now too, as Gl4 is phased out. I would run the cheapest xw90 I could get easily
You live in Nicaragua. Shipping from rockauto.com etc will be expensive. I suggest getting whatever fits locally. Maybe pull the pump and check the numbers
Mobile 1 only for the brand recognition and upsell. The rest, use the cheapest bulk synthetic that meets spec (Safety Kleen, Amalie, Warren, etc) also offer filter upgrades Champ XL, Fram XG, Mobile 1, etc