Just picked up a 78 FJ40 (Luke's). I'm base lining the fluids. Seems like there are a lot of opinions on what 90w (GL-4/GL-5/synethetic/dino/ect) to use in the tranny, t-case and diffs. I searched but did not find what I was looking for. Whats the general consenses?
I also discovered my front diff fluid has mixed with the birf grease. Time for a knuckle and wheel bearing rebuild. With only 92k miles, the grease might be original
I'll be posting a separate question on that.