Got a well used Sunbird that will not go into fourth gear. Even if the car is not running I still can't shift into fourth. It has also started to gring a bit when I upshift and downshift into third. All the other gears work great without an issue. It is a 94 2.0L Sunbird Se if that helps. I've checked the shifter mechanism and the mechanism at the other end of the cables on the top of the tranny and there are no obstructions. The fluid in the tranny also looks good. Do the cables ever need to be adjusted? Any other ideas?