Noise on my 70 with new muncie - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 37 (permalink) Old Oct 16th, 19, 10:16 PM Thread Starter
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Noise on my 70 with new muncie

70 Chevelle. Took the 400 out put new m22 itís new clutch etc. first install , vibration was so bad I couldnít drive it. Removed tranny and had clutch balanced with the old flex plate that was with the 400. Vibration better but definitely not smooth. Shifts great but now Iím getting noise when clutch pedal released. Iím thinking either the imput bearing or the throw out. Only about 100 miles or so on the new setup. I want to get rid of the vibration. Not sure if I should be looking at alignment issues, driveshaft, imput bearing should not have gone bad this soon. I havenít checked oil level yet on the Muncie. Any ideas as where to start. Vibration increases with higher speeds. Tracy.
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post #2 of 37 (permalink) Old Oct 16th, 19, 11:20 PM
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Re: Noise on my 70 with new muncie

Does it vibrate in neutral as you rev it up?
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post #3 of 37 (permalink) Old Oct 17th, 19, 1:35 AM
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Re: Noise on my 70 with new muncie

There could be a lot of things going on. So prepare to check lots of things

1) did you ensure there was an airgap between throwout bearing and clutch fingers? If the bearing was touching, it would wear out within about 100 miles. I know this, cause it happened to me.

2) Did you check your bellhousing alignment? If your way off center, it can cause issues. Though usually it'd create shifting problems

3) Can you explain the noise? Does it sound like it's coming from front of transmission? Does the noise happen while driving and goes away if you push in the clutch?

4) Check your driveline angles. Ideally you want equal and opposite operating angles of the U joints under 2*. Sometimes that is not always possible. Download the Tremec driveline angle finder app, it's free and easy.

5) where is the vibration? Is it in the shifter, or your pedals, or the whole car?

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post #4 of 37 (permalink) Old Oct 17th, 19, 1:39 AM
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Re: Noise on my 70 with new muncie

Pull the whole thing and start over. Align your bell housing, replace the input bushing, check the input bearing on the trans. Inspect all the parts for signs. Your disc may be bent too. But usually, this would creat release issues.

Sounds like the clutch disc is being allowed to move and when you release the clutch the disc is not centered causing the vibration.

When you are sitting stationary and rev the engine with the clutch out you should be able to feel the vibration if the above is the case. The vibration could at times be less or worse depending on where the disc settles and how far out it sits. You may not feel the vibration with the clutch in when you rev the engine.

Using an externally balanced flywheel on an internally balanced engine could also cause the vibration.

Check your u joints. You would have no vibration when reved up if the issue was further down the driveline.
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post #5 of 37 (permalink) Old Oct 17th, 19, 7:18 AM
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Re: Noise on my 70 with new muncie

What flywheel? And then do what VInce said, rev in neutral and see if its still there.

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post #6 of 37 (permalink) Old Oct 17th, 19, 8:06 AM
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Re: Noise on my 70 with new muncie

What engine ? Which clutch ? Which flywheel ?



Quote:
Originally Posted by Tmiller View Post
Vibration increases with higher speeds.

When you say higher speed do you mean MPH or higher RPM ?

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post #7 of 37 (permalink) Old Oct 17th, 19, 10:14 AM Thread Starter
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Re: Noise on my 70 with new muncie

Iíll check and verify that. Stay tuned
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post #8 of 37 (permalink) Old Oct 17th, 19, 10:16 AM Thread Starter
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Re: Noise on my 70 with new muncie

Iíll check the rpm in neutral. Iím afraid the tranny wasnít aligned from the start. Stay tuned
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post #9 of 37 (permalink) Old Oct 17th, 19, 10:18 AM Thread Starter
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Re: Noise on my 70 with new muncie

When checking in neutral would it matter if clutch pushed in or out. Iíll do both. Thanks. Stay tuned
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post #10 of 37 (permalink) Old Oct 17th, 19, 10:20 AM Thread Starter
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Re: Noise on my 70 with new muncie

At this point, I donít remember the flywheel It was new. Iíll check receipts I guess. The clutch is a hays. New as well.
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post #11 of 37 (permalink) Old Oct 17th, 19, 10:50 AM Thread Starter
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Re: Noise on my 70 with new muncie

Ok I ran it in neutral with clutch in and out. No vibration. Leaning toward the driveshaft. Am I correct in that assumption? This would eliminate a balance problem, correct. Also, when I started it and tested , engine was cold and I did not hear the noises I was earlier referring to.
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post #12 of 37 (permalink) Old Oct 17th, 19, 12:26 PM
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Check driveline angles.
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post #13 of 37 (permalink) Old Oct 17th, 19, 12:54 PM
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Re: Noise on my 70 with new muncie

454 big block uses a different flywheel than 396 or 427.Small block Chevy 400 uses a different flywheel than all the other small blocks.If what flywheel you used is not the correct one you'll never fix that vibration.
Up to this point you haven't said what engine just "70 Chevelle"
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post #14 of 37 (permalink) Old Oct 17th, 19, 4:07 PM Thread Starter
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Re: Noise on my 70 with new muncie

Ok, itís a Chevelle ss 454. I just dropped the driveshaft and am having it checked for balance just in case for process of elimination. I revived in neutral and no appreciative vibration. The sort of knocking noise when I release the clutch was not there this morning on a cold start. Iím ch cling on correct flywheel. I bought new a couple of years ago with all the clutch parts. Just got around to the swap. .
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post #15 of 37 (permalink) Old Oct 17th, 19, 4:20 PM Thread Starter
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Re: Noise on my 70 with new muncie

Ok. I called summit where I purchased flywheel. It still was on file. Itís a 11Ē diameter disc with 1 1/8 diameter shaft with 26 spline. Part number 700180. Iíll research it. I do remember it as being balanced out of box seeing the drilling marks. Any info would be helpful.
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