Is the clutch the problem? My 1993 gmc pickup with the engine running I can shift to any gear without engaging the clutch ?it does not grind or try to move.

You mean the stick just falls into gear? while engine is running and the car lurches forward? I would say the gates are wore out in the transmission, but even at that, it should not go in gear unless you have the clutch pushed in, IF it were to try to engage while car is running, the shifter would come in contact with the gear in the trans and grind because the clutch would not be engaged. Maybe somehow the linkage got bent on the transmission while they were replacing the pulley on the car or a bushing broke on the shifter linkage?

It jump because the clutch disc itself is good, but the clutch is not engaging-the pedal is not making the clutch engage. When it does, then you can shift without grinding, then you can shift period. Clutch pedal operates a cable or it operates a hydraulic system-they both, which ever one you have, move the clutch fork on the transmission bell housing just a bit to cause the clutch to disengage the transmission from the engine's flywheel...so you can shift, see, easy, smooth shifts, no problem, no grinding. Your clutch itself is okay, the pedal is just not operating it.

clutch could be worn out ?
how many miles since it was replaced ?

If you're sure that the clutch hydraulics are working properly ... then you are going to need to pull the transmission to see why the release isn't working .... bad throw out bearing, problem with pressure plate or ??

Trouble shooting here:
http://www.ncttora.com/fsm/1993/clutch/1troubles.pdf

Depending how many miles are on the vehicle, the clutch plate may need to be replaced. Do you hear any strange "grinding" noises when engaging or disengaging the clutch? I'm assuming you have checked the hydraulic fluid in the reservoir and it is full. You may also want to change the fluid as hydraulic fluid deteriorates over time and it may not be completely disengaging the clutch. Please rate this answer, thanks.

If the transmission "grinds" or just simply can't be pulled into gear when you try and place it in 1st gear then the clutch most likely isn't releasing far enough to allow the transmission to completely stop turning and the gears will clash or not go in as you try to place it in gear [when the engine is running that is] If this is the case however it should shift easily in and out of gear if the engine is off. Often the same clashing will also occur when trying to shift into reverse. There's usually three possible causes. The clutch master cylinder could be low on fluid or leaking pressure internally, the slave cylinder could be seeping fluid or have air in it or the line leading between it and the master cylinder, or there could be an problem with the clutch disc or pressure plate. I see all three problems on a pretty regular basis so you may need to have it checked out at a service facility to know for certain what is causing the problem. Good luck, hope this helps you out.

It sounds like your clutch isn't releasing properly. Do you need to adjust the pedal free play or bleed the hydraulics? If that doesn't fix it you may need take another look at the clutch you put in.

the throw out bearing is bad ,so change bearing and clutch

the transmissino is slippin id try to replace autmatic clutch or check fluids

ok every time you open the clutch resevoir you have to bleed the slave ..next hold down the clutch to the floor open the bleeder screw 10 mm bolt and then close it and pick the pedal up off the floor if your clutch is not right the pressure plate is failing most likely on mitstu stuff ...bleed first ..