Any GL-5 gear lube will be fine inside your axles. If your Dana 35 has a Tracloc limited slip differential inside, just make sure the gear lube you use includes words on the back label like "Compatible with limited slip differentials" which means it has the additive required by a Tracloc.
The exact viscosity is not as important in an axle as it is in the engine. A 75W-90 is a good choice, so is 70W-80 or 80W-90. If you tow, use a heavier viscosity like 80W-120, 85W-140, etc.
I doubt there is a brand of gear lube I wouldn't use but I normally use Valvoline, Castrol, or Torco. Personally, I prefer a conventional gear lube in the axles though for most of us, a synthetic is ok too.