How to disassemble and assemble a clutch slave cylinder for a 1988 GMC S15 truck

SOURCE: 1987 gmc s15 2.8 litre. Clutch only goes half way

I don't know that specific vehicle, but if its a hydraulic clutch it sounds like either you have a leak and your clutch fluid is low, or the master or slave cylinder could be bypassing internally. Check the fluid level in your clutch master cylinder. If its low, you should top it off with brake fluid and will probably have to bleed the system. Also look for leaks. You can probably find info or a video online of how to bleed the system. Its a bit hard to explain without illustrations or pictures. Not really very difficult to perform. Good luck.

SOURCE: My 1993 GMC truck does not have much clutch. Is

Hydraulic clutch will only go so far.No way that I know of to make it go farther .I guess you could try making a little extention to your rod end to make it longer.

SOURCE: my clutch goes to the floor, can't shift. Have

Provided the mechanical portion of our clutch is good then you still have some air somewhere in the hydraulic system and it's often very hard to get out. One trick I use is to use my hand vacuum pump with a little cover I made to cover the fill hole on top of the master cylinder. I pump up about 15" of vacuum on the system and often that will pull out the few air bubbles submerged in the fluid that prevent the system from working. Once you get most of the air out usually the rest will work out if you press and release the clutch pedal several times. Sometimes it works very quickly, sometimes I've fought them for an hour or more to get back to a normal pedal. Of course if you have an actual mechancial problem inside the bellhousing with the pressure plate or disc then nothing you do on the outside will work until that is repaired.

SOURCE: how to replace a clutch and a slave cylinder

I recommend you get the Haynes repair manual on your vehicle. That will explain how to do it correctly.

SOURCE: replace u joint on GMC S15 pickup

You'll need a bench vice for this. A few sockets help as well. Once you get the shaft off the truck, put a smaller diameter socket on one side and a much larger diameter socket on the other and sandwich in a vice. Compress vice to drive the U-Joint through shaft (smaller socket will drive the one side through the other with the much larger socket). Installation is the reverse of removal.