I knew the pedal hanger bracket was the same on the 80-86's. But I was pretty sure I remembered something different on the pedal arm. Thanks for clearing it up. The last 80-86 truck I had was back in 2009 and it was a 84. So it already had the hydraulic set up.

 

 

I never looked at how much travel mine had when it was hooked up, but that doesn't look like enough to me.
It needs to move enough for the fork to press the throwout bearing into the pressure plate 'fingers', and make it disengage the clutch.

 

 

https://www.ebay.com/itm/Clutch-Peda...8:pf:0&vxp=mtr

It's not the easiest item to find. Although, I do see them at my local junk yard from time to time. Most trucks were automatics.

 

 

 

Can you get a video of the sound?

Have you tried driving it yet? Does it go?

Does the sound come and go when you press/depress the clutch? Or is it constant 100% of the time it's running, no matter what?

 

 

That doesn't sound like your clutch then. That would most likely change with pressing your clutch pedal as the throw-out bearing presses against the pressure plate.
Is the transmission new/rebuilt?
Do you have a transfer case? (And is it the same one?)

 

 

Did re-use the automatic block spacer plate? If you did, the flywheel could be rubbing on the plate. Or it could be the starter if you are running the automatic starter. Or it could be something else.

If it was the clutch, throw out bearing or transmission it should change when you step in or let out the clutch pedal. A bad throw out bearing would be noisey when the clutch pedal is stepped in. A transmission should stop making the noise when you stepped in the clutch pedal. I've got a 4spd with a bad input shaft bearing. It's noisy when you let out the pedal. But stops making the noise when the clutch pedal is pushed down.

It's hard to tell exactly what it is without hearing it in person.

 

 

Did you replace the throw out bearing or is it a used one? It's the part that goes on the clutch fork. It could still be making the noise if your slave cylinder is applying too much pre-load. If this is the case then the throw out bearing is always in contact with the pressure plate fingers instead of lifting off them. But I would still expect at least the pitch of the noise to change as you step the pedal in or release it.

 

Is the transmission new/rebuilt? Or is it used?


On the throwout bearing, I had an unknowingly bad one that I reused, and it chirped and chattered when I let the clutch out and was whisper quiet, when I put the clutch in.
I had a new one that also made some noise (a little chirping) that came and went with the clutch pedal.

Both were a rather high pitched chirping noise, not a scratching/rubbing sound..
Even the bad one, right up until it completely grenaded inside the transmission (the only time I've ever had to be towed home), wasn't alarmingly noisy.

That's why I'm curious about the transmission itself. Maybe a bad bearing in the transmission is making noise.

Otherwise, a bolt that's not fully seated (although that'd be more of a knock), or something on the rotating assembly of the clutch/pressure plate that's offset and rubbing the inside of the bellhousing.