Well recently I have noticed when ever I would shift from 3rd to 4th or from 5th to 4th it would grind when I engage it. This happens sometimes when I am daily driving, but everytime I shift agressivelly it would grind. Right now my conclusions are that maybe my 4th gear is little off in teh gear box, or maybe something is wrong with the syncros. Im not sure what could be. I don't think that it is suppose to be like that.