When I am going decently fast...or at about 3-4000 revs - if im changing into 4th or 5th the gear will grind (up or down into gear). Some people that i've spoken to agree that my synchro's may be ****ed...but they don't agree on a price. Some say 10g some say 2g.
If anyone can help me out, if u know something else that may be causing this grinding, or know how much this is going to cost me - please comment! I am not too stressed about it as long as its just a synchro and not actually affecting my engine/parts in any way.