"I hear a grinding noise when I shift gears"

"Find em don't grind em"

That grinding noise when you shift into forward or reverse is not a good sound.  Sure, some clunking is normal but the grinding before engagement can actually be damaging the clutch dog and gear lugs.  These lugs, once worn or rounded can lead to the lower jumping out of gear.  To save wear and tear on your gears make sure to shift quickly into gear.  Do not drag it slowly, and make sure the engine is idling at the correct RPM and your controls, cables, and linkages are all in good shape.