Just like the title says. I searched but it kept bringing up throw out bearing. Which I don't think it is anymore just by reading on the symptoms. It's an irregular knocking. I read up on how manual transmissions work and clutches and I'm now suspecting a input shaft bearing. What do you guys think? Pedal up, knocking, pedal down(disengaged) no knocking..

 

How long has the clutch disc been in the car?

 

To be honest I don't know, I just got the car in July. The clutch still works fine, goes into gear fine.

 

Id bet on the TO bearing if it drives fine let it be just have a replacement lined up
If the thrust bearing was going out youd probably have other issues (could cause a knock). Like being able to move the crank back and forth
Im no authority for sure but Id say run it

 

I read up on the throw out bearing and when that goes bad apparently it makes a noise when the clutch is pressed in. I already have a performance clutch kit on my wish list lol, I'm not too worried since it runs completely fine. At first I thought it was knocking from the motor since I just recently did a cam. But I tested that by pushing in the clutch. As long as it last till spring I'm fine lol. New drivetrain, motor, supercharger, suspension, wheels and tires, new posi unit..etc

 

both of my 5 speeds in my 89 had a erratic knock when not in gear. never had an issue when they did this. the first one finally went but it had about 172 k and the other one I sold recently to make way for the T-56 and the knock went away (or I couldn't hear it anymore due to the exhaust tone) but still worked when I sold it.