85RunnerSR5

I'm not sure where the fill plug is located on my 5-speed transmission in my '85 4Runner and I'm not sure which transmission it is. I know that Toyota had a couple of different ones. Let me know where it is and what brand of gear oil is the best to put back in it. I know it takes 75W-90 but which brand is best for it? Thanks.

I'm planning on taking a long distance trip in a couple of weeks and I'm wanting to change it before I head out of town.