If I drive my car normally, with slow gear changes it's runs okay. If I accelerate hard and change gear reasonably quickly (with relatively high revs) the gears really crunch, almost like when you lift your foot off the clutch too fast or don't quite get into the gear properly. Also, sometimes I have to press the clutch down twice as the car won't go into gear properly.
Is this likely to be a clutch problem? Or is it more of a gearbox problem? Maybe check my gearbox oil?
Car is a 95' yj, RHD, Manual, Petrol, 4Li.