There are numerous ways that you can tell if your transmission's clutch isn't working right. As far as performance is concerned, you may notice that acceleration is weak and isn't as potent as it used to be. Driveability-wise, you might also experience issues such as gears grinding more often. As well as, odd screeching noises as you're shifting gears and a burning smell from the transmission. The gearbox itself would also exhibit countless issues when the clutch has gone awry. These include its inability to change gears, refusal to stay in a particular gear, in addition to a loose or sticky clutch pedal.