I have a 89 camaro and when i try to put the passenger side window down it goes down about 4 in then makes a grinding sound. Would this be a window moter problem or a regulator problem? I just dont want to replace the motor and that not be it.

More than likely a regulator. If you look on E bay for a used motor they usually come with the regulator and all. Or go to the junkyard and pull one. The morot and regulator rarely go bad in these cars, I still have the originals in my 85.

Pull off your door panel and look to see what it is. Its pretty easy to take it off, in fact mines off right now!