Need Help on Fluid choice

Kendog 170 said
I just use 85W90 in mine. That's just me. Why Hypoid? Thought that was for Posi in rear diff.

POSI? Thats a 4 letter Chevy term. :rofl: Anyway, I remember having ATF in my 74 360 Duster 833, & I'm pretty sure it came from the factory that way.