I was checking my fluids today out of curiosity. Well the tranny is now, I can't tell how much low, but I can't feel it though the filler hole with the car level. I figure I should top it off. Now I know it takes GL-4. I don't have any. My "old muscle car" dad says GL-5 should be fine to top it off. He said it was slicker.

Ok to top off with GL-5, or wait and drive it around with it low till I can order GL-4 since nobody sells it here.