When changing gear the movement of the gearstick is more awkward than it was before and there's often a strange noise coming from the gearbox area.
Changes between gears have become difficult, the gearstick no longer moves freely between gears, it sometimes seems to get stuck or won't go into a gear properly.
When driving along the gear stick will suddenly pop out of gear into neutral, this will often result in over-revving the engine if your foot is on the accelerator. It will often also be difficult to change into some gears.