My TD5 gearbox is difficult on gear selection, sometimes no bother but more often than not its difficult to get into 1st gear and reverse gear, 2nd a little difficult but the others no problem, there seems plenty of bite on the clutch and its not slipping. I thought this was normal until i drove a mates td5, it was so smooth in gear change it made mine feel like a tractor. Any ideas what could be wrong?