if you hear thundering hooves on the horizon, don't think zebras..... in this case, if it grinds going into 1st or reverse, the clutch is not fully disengaged. And the very most likely cause of that problem is the adjustment of the pressure plate/clutch cable/throwout bearing. If you have a standard cable, rather than a hydraulic clutch assembly, there should be a large wing nut on the adjustment. There needs to be a small amount of pedal travel before the throw out bearing touches the pressure plate release fingers. How much? I personally shoot for no more than 1/4-1/2" travel of the pedal before the throw out bearing contacts the fingers. How can you tell when that happens? On my car I can move the throw out arm by turning the arm manually until it contacts the fingers, you can feel it when it contacts....I am using a hydraulic system on my car as well as a 2100# Kennedy pressure plate, but the adjustments are the same.....