topped off my trans with ATF about 4000 miles ago, but ive been hearing from some people to run 75-90 gear oil, my dad said ATF is fine but id rather get a second opinion. Car has 94k on it, sometimes hard to shift from 1st to 2nd, but never grinds or pops i think thats just the linkage or something because 2nd to 3rd and 3rd to 4th feel fine.