synchro plates went out
If it will shift when the engine is off, but not while it is running your clutch is not working
If it has a hydraulic clutch, it is probably the slave cylinder. You could still have pedal but the slave is letting the fluid past the seals. Have someone watch the slave while the clutch pedal is pushed.
If you have bleed the system and If it will not go into gear with the engine running, the clutch pressure plate may have failed.
you just suck at a stick shift
It is quite possible that your clutch is not disengaging the transmission from the motor. Also, your synchros could be bad, which would not allow it to go into gear.
1999 ford explorer 4.0 manual transmission gear shifter wont fit on shaft
The clutch is master and or slave cylinder are bad
Your clutch is slipping.
well it depend on the gear. like in mine the low or granny first is hard to get into. i have to let the clutch out a little while at a stop then slip it into gear. if its other gears it may be a clutch problem. if not then there is a problem with the trans and it needs to be rebuilt.
When you put it in gear, does it pop out? What gears? If so, you probably have a bad transmission. It the clutch is slipping, you need to adjust the clutch cable.
A clutch does not go into gear. A clutch engages, Normally if a clutch fails to engage it is because it is worn. with a worn out clutch you are able to start the car in gear without your foot on the clutch and the car wont move. Normally before this happens you will notice what is known as a slipping clutch. A slipping clutch means that the engine is turning faster than it should to keep the car moving while in gear. once this starts to happen it does not take long for the whole show to come to a stand still.
Either the linkage between the pedal and the throw-out bearing is damaged or the clutch fiber disc is worn and needs replaced. The worn clutch is most likely. Consult a mechanic, this is not a shadetree operation. The clutch allows the spinning crankshaft of the engine to be "interrupted" before it get to the transmission. Your engine and transmission are both turning when the car is running and in neutral, the clutch basically stops the the transmission from receiving power and this allows you to choose a gear, letting out the clutch allows power back to the trans, and this allows the power to get to the wheels through the chosen gear.