how to tell if clutch is slipping
Wrong. It'll happen in any gear. Hard starting the car will do it. Pulling away with clutch fully let out, full throttle and the car only seems to be crawling? Thats it. Dropping from top to 3rd to pull away faster and although the engine redlines the car hardly accellerates, that'll prob be clutch slip too. To say it will only happen in the 'correct' gear is simply wrong. Put simply an increase in revs should lead to a corresponding increase in speed, If it doesn't then either your tyres are smoking or the clutch is! Some people test the clutch by putting the parking brake on, putting car in 2nd gear and slowly let the clutch out, car should stall easily. If engine seems to hang in there then it's because there's not much meat left on the clutch plate. Chris
First, it has to work correctly in the correct gear before the clutch is ruled out as bad. For example, you're stuck in fifth gear or loose clutch fluid pressure in an auto then there will be little or no movement of the car. Also if you're stuck in first gear or sometimes stuck in really low gear then there will be little movement of the car even though the clutch is 100% fine. Yes, it can slip in any gear but the clutch should slip at the normal gear before it's diagnose as bad on autos. Some autos are really quite and don't have an rpm indicator, so it can be somewhat confusing. Sounds like we were confused with the OP lack of info. He didn't mention manual or auto which displays different symptoms.
although there are clutch packs in an automatic tranny, if someone asks how to tell if their clutch is slipping, i assume theyre driving a manual.