You'll never get everyone to agree on this one.
But I'll go first and let everyone else take potshots at me.
First, Dino oil. Synthetic tends to weep or bleed through gaskets and seams on these old beasts. They were designed with Dino in mind, no reason to second guess that on a stock or mild build.
90w in the rear, with limited-slip additive if needed.
For the trans, check the appropriate year FSM- factory recommendations changed over the years. I've never gone wrong with 90w in a four speed, and I live in the frozen tundra...
:popcorn:
