Hi, i own a 1970 BMW 2002 and of late i have been having some probs. Sometimes while driving, the moment the clutch pedal is engaged, there's a loud knocking sound heard underneath the car. Also, sometimes while driving, some of the gears are stiff and hard to find, and at times, grind when going in. At times it takes me a whole 3 secs

to find a gear. But this doesn't happen all the time, so i'm not sure what's up. Please help.
