Transmission Problems?
 

I have a 1994 C280 and it runs great. The problem is last week I noticed that when it shifts from 1st to 2nd, 3rd, and 4th it gets to 4th at about 20-25 miles per hr. It shifts smooth as silk but it didn't used to shift through the gears that fast. I can change gears with the shift and it shifts smooth that way. Also, when I'm in 4th at say about 30-40, when I punch the pedal to the floor, it won't down shift. Any ideas?
Thanks in advance