Stick to Mean Gene's advise. He knows. The tranny you have can ONLY run with fresh type IV toyota tranny fluid do not experiment with this tranny, stay away from synthetic lubricants in the tranny!!!
If you have 115K it is NOT a good idea to switch to full synthetic motor oil NO MATTER what the store salesman tells you...stick to regular mineral based oil of a good reputable brand. If you want run a synthetic blend but not full synthetic.