First Gen Manual 4x4 - GL-4 gear oil options?

[ayjay]

Redline MT 75W90 is proving very difficult to find locally.

I found some Royal Purple 75W90 that claims it is fully compatible with both GL-4 and GL-5 standards and will not corrode brass parts.

Are there any other GL-4 options that won't require a specialty order for the differentials, transmission, and whatever goes in the transfer case?

[ayjay]

Well, nevermind. I found a local Amsoil dealer about 2 miles from my house that carries their GL-4 75w90 gear oil.

Going to put it in tonight, or maybe tomorrow.