Yesterday I was going down the road in 3 rd gear when all of a sudden this loud grinding noise starts up. I down shifted and came to a stop. I checked to make sure that it had not been bumped into 4 wheel drive but still could not figure out where the grinding was coming from. A while back it did something similar and turned out what the mechanic said was the fly wheel ring had slipped. I didn't really understand but it was fixed for awhile. It sounds kinda like the clutch or throwout bearing. When I went back to get it later it was fine. could it be the clutch fork had stuck or something like that? I really doubt that it had healed itself, But that would be nice........Any thoughts???????