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Is it noisy? like singing or whistling when the clutch pedal is pressed? To replace it, you will have to pull the transmission off, so might as well get a new clutch pack. It will have a new clutch disc, pressure plate, and clutch release bearing -AKA throw-out bearing.
A separate throw-out bearing is about $30, a new clutch pack is about $150. You wouldn't want to replace the bearing, and then have to do it all over again to replace the clutch.
If your clutch won't release properly, it will continue to turn the
input shaft. This can cause grinding, or completely prevent your car
from going into gear. Some common reasons a clutch may stick are:
Broken or stretched clutch cable - The cable
needs the right amount of tension to push and pull effectively.
Leaky or defective slave and/or master clutch cylinders
- Leaks keep the cylinders from building the necessary amount of
Air in the hydraulic line - Air affects the
hydraulics by taking up space the fluid needs to build pressure.
Misadjusted linkage - When your foot hits the
pedal, the linkage transmits the wrong amount of force.
Mismatched clutch components - Not all
aftermarket parts work with your clutch.
Another problem associated with clutches is a worn throw-out bearing,
sometimes called a clutch release bearing. This bearing
applies force to the fingers of the spinning pressure plate to release
the clutch. If you hear a rumbling sound when the clutch engages, you
might have a problem with the throw-out.
You must remove the transmission from the vehicle. The clutch release bearing (throwout bearing) rides on the input shaft of the transmission, and is the only part of the clutch kit that remains attached to the transmission upon removal.
Make certain you reattach the bearing retainer mechanism to the bearing fork, so that the bearing doesn't ride on the face of the pressure plate while you're not using the clutch pedal.
If there is only one click when you go into first or reverse. Then look at the linkage on the clutch pedal. If you push the clutch pedal down and up (without putting it into gear) does it still make the click sound? Is the transmission going into gear normal? Is the throw-out bearing making any noise? A throw-out bearing can make a loud click noise.
That truck is getting long in the tooth, so to speak, so I am unsure if it is a linkage activated clutch or a hydraulic activated clutch. If it is a linkage clutch it sounds like the linkage needs adjustment. You need to have the linkage adjusted just right so the throw out bearing is fully off the fingers of the clutch, but not to excess or the bearing won't throw out enough to separate the engine from the drive line totally. A good rule of thumb is no more than one inch of free play at the top of the pedal. If this is not correct it will not allow the truck to go into gear and if it does you will grind the gears because the input side of the transmission is still rotating.
One good thing about a hydraulic system is that the pedal is linked to the clutch hydraulically so free play is not required but there can be no air in the system not even a bubble or the slave unit will not deliver a full stroke to the clutch fork. This will have the same affect as the linkage not being adjusted correctly. You will need to bleed the assembly and sometimes it takes a lot of bleeding to get the air out. It is a two person job. Run some brake fluid through the system by opening the bleeder on the slave cylinder attached to the transmission. Have a helper depress the clutch pedal until it touches the floorboard. Have him tell you so you can close the bleeder.Once the bleeder is closed have your helper push the clutch pedal several times pausing 5 seconds between each push. Keep an eye on the fluid resovoir for the clutch and fill as needed. Do this untill you either remove all the bubbles or the clutch feels good again. It can take a lot of time to move the air down the pipe so be prepared.