When I run the car cold (as it needs to be), and I shift into 2nd, it get an audible grind (but the gear catches fine). As the car warms up, the sound disappears completely on 2nd gear shift. Occasionally, I'll feel the gears grind when I shift into 3rd (hot or cold engine). Is it my clutch? Or my transmission? Would it need to be rebuilt, or can this be fixed by changing the tranny fluid?
 
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