It doesn't go into 4th at all. I tried engaging the MANU button and shifting manually from 1-2-3-D, but it still doesn't get to 4th. I've never changed the trans fluid or filter, and it's in the shop now for that (got the car w/25K on it, it has between 110K & 120K now). The RPM increases while in 3rd, instead of decreasing and going to 4th. I know that 2K rpm in 4th is about 60 mph, and that's not happening. I also read the threads about the fluid needing to warm up, but this is after more than 10 - 15 mins has elapsed.