anyone know what could be the problem?

 

It won't go into 4th gear, or when you press the O/D off button nothing happens? If something is wrong with the transmission, it'll go into safety mode which prevents you from using the 4th gear (overdrive). I would think if this happened though, the O/D light would flash to let you know something is wrong.

 

when i press the overdrive button nothing happens. no light either

 

How fast are you going when you press the O/D button? You need to be going a reasonable speed for it to do anything, having said that though, the light should come on when you turn O/D off no matter what speed you're going.

 

my overdrive button is broke too if thats what your talking about, it used to light up and kick out of overdrive when i pushed it but it does nothing now. any suggestions?