I used it as an assembly lube when I had to do some repairs to my od 3 speed. Stuff works great for that. I'm currently using a roughly 70/30 mix of Lucas gear oil/oil supplimen in the tranny, shifts much better than before. It does leak a little, but it did that before with regular gear oil in it.
I did use what was left in my S10, just to se if it would make any difference in performance/mileage. So far, no major difference.