91 eclipse not shifting
 

Hello, i'm new to this group so please bare with me.
I'm helping a friend out with a 91 Eclipse, the problem is it's not shifting out of second gear. I know this sounds weird, because i didn't believe it at first either. but after taking it out for a drive i seen it for myself. It is a total dog when starting out. once it gets to about 25mph or so it will start to move, but then it won't shift out of second into 3rd. So as far as i can figure it starts off in 2nd and never shifts. I don't know much about this car, (i'm a GM man myself) so any advice would be very helpful. thank you.