My transmission was never serviced. I am nearing 60,000 miles on it and the only thing I've done to it is the oil change, cleaning out my air filter, replaced cabin filter a few times already, and regular tire rotation. I do a lot of freeway driving and gone through a set of tires already. Ha, even my brakes have never been changed out yet thanks to the freeway. I hardly every commute in the city streets except to get off when it's near my work, groceries, fast food, gas, stores, etc. Otherwise, I'll drive on the freeway even if I have to get off the very next exit
Oh, it's an automatic transmission which is why I'm concerned about the transmission fluid.