I am using a D90 with a Nikon 28-300 3.5 lens. In football and some basketball pictures I can not get a fast enough shutter speed to prevent blurry pictures. Tried everything I know to do.
Post up a photo with the exif data so we can see your settings.
Most likely, your ISO is just not high enough to allow for a faster shutter. But it could also be your aperture. Either way, we need and example posted up with the exif.