I am working on a GMC 3/4 ton with a 270 il6 and Muncie SM420, 2 piece drive shaft with center carrier. The noise occurs when the clutch pedal is released. The intensity of the noise does change during relase; as you let out farther it seems that the noise gets milder. When in neutral, the noise is very quick; when in gear the noise starts loud and fast and seems to get slower and lighter as the clutch engages the flywheel. I installed the clutch plate with the side that said "Flywheel" facing the flywheel.
I actually laid in bed thinking about this alot last night and what I recalled what that before I adjusted my linkage, I could depress the clutch and then let it out and not hear anything, however when the clutch pedal was pressed the trans. output was still turning. I adjusted the linkage and the Trans. output shaft quit spinning when I pressed the clutch pedal but when I release it I get the sound.
I am leaning toward the fact that I may have overcompensated when I adjusted my linkage. Could that have caused what I am hearing? I have about 2.5" of travel for the nuts that allow the adjustment and I bet I adjusted it by 1". I also hooked up a spring that was down under my steering box back to my clutch linkage where the linkage joins the fork arm. I am not sure that this is where it goes, but it was connected under the steering box and hanging loose and I could not find any pictures which tell me where it goes.
So, am I just a bone head or what? How do you think this should be resolved? I appreciate the help!
Tom
