Noise on my 70 with new muncie - Page 2 - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #16 of 37 (permalink) Old Oct 17th, 19, 4:22 PM Thread Starter
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Re: Noise on my 70 with new muncie

I meant higher speed.
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post #17 of 37 (permalink) Old Oct 17th, 19, 4:27 PM Thread Starter
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Re: Noise on my 70 with new muncie

Quote:
Originally Posted by JF74chevelle View Post
Check driveline angles.
Ok. Next on my list.
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post #18 of 37 (permalink) Old Oct 17th, 19, 4:58 PM
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Re: Noise on my 70 with new muncie

I just looked at the flywheel you bought and it is not for a 454 BUT . . . in your original post you said that you had it balanced to match the flexplate you had on the engine with the TH400 ? Correct ? If that is the case it should be fine.

So . . . . .

If you dont have a vibration in neutral then it is probably not the flywheel or clutch. Most likely the driveshaft or something else from the transmission back.
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post #19 of 37 (permalink) Old Oct 17th, 19, 6:07 PM Thread Starter
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Re: Noise on my 70 with new muncie

Thanks for that. Yes I had it balanced as you stated. Driveshaft is off and being checked for balance. I hope that is the case. We will see I will post when I have it back on. Also will check the driveangle.
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post #20 of 37 (permalink) Old Oct 17th, 19, 6:36 PM
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Re: Noise on my 70 with new muncie

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Originally Posted by Tmiller View Post
Thanks for that. Yes I had it balanced as you stated. Driveshaft is off and being checked for balance. I hope that is the case. We will see I will post when I have it back on. Also will check the driveangle.
I am confused. You keep talking about balancing the clutch to a flexplate. Flex plates are for automatics and I assume you are calling your SFI rated flywheel that you bought which BTW is for an internally balanced small block. The 400 SBC and 454 BB use an externally balanced flywheels so if you are using the part number Summit 700180 on a 400 or 454 its wrong. Am I missing something here?
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post #21 of 37 (permalink) Old Oct 17th, 19, 9:42 PM
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Re: Noise on my 70 with new muncie

I doubt the driveshaft is out of balance, unless it is bent. Was it in the car before? More likely the angles are incorrect causing vibration.
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post #22 of 37 (permalink) Old Oct 18th, 19, 12:55 AM
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Re: Noise on my 70 with new muncie

Is the driveshaft a " 3-R " shaft?
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post #23 of 37 (permalink) Old Oct 18th, 19, 1:48 AM
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Why would the driveline angle need checking if he has a Muncie installed on a factory crossmember and the rear end installed in the factory location? Did I miss something? Curious...
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post #24 of 37 (permalink) Old Oct 18th, 19, 2:47 AM
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Quote:
Originally Posted by 6T9 Chevelle View Post
Why would the driveline angle need checking if he has a Muncie installed on a factory crossmember and the rear end installed in the factory location? Did I miss something? Curious...
Car could be lowered or raised changing angles. I just threw the thought out there as something to check

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post #25 of 37 (permalink) Old Oct 18th, 19, 7:23 AM
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Re: Noise on my 70 with new muncie

If that part # is correct , you have an INTERNAL BALANCE flywheel , whereas a 454 is EXTERNALLY balanced meaning it literally has a slug of metal bolted to the wheel. If that is true, the vibration ought be there always.

Driveshafts out of balance usually feel like it at 55-60 mph.
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post #26 of 37 (permalink) Old Oct 18th, 19, 7:35 PM
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Re: Noise on my 70 with new muncie

Didn't read all the replies, but, some things to think about..

Gene is right on with the flywheel.
If that is true, it could be bad news.
My engine builder balanced the rotating mass together.
That means the crank, rods, pistons and flywheel and harmonic balancer. He did drill the flywheel some.

Hopefully,

its the pressure plate out of balance, which is a long shot,

or the bushing in the end of the crank for the trans pilot shaft is missing or the wrong size.

If the flywheel was not bolted squarely with the crank flange, it would vibrate like crazy.

If the pressure plate were not fitting flat on the flywheel, it would vibrate like crazy.

If the bushing in the end of the tail stock for the drive shaft were wrong, worn out or missing, it would allow the driveshaft to run out.

Check your tranny mount for excessive play. you should have put a new one in there.

Do you have the wrong harmonic balancer on there?


When you find the problem, please post the solution.

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post #27 of 37 (permalink) Old Oct 19th, 19, 10:31 AM
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Re: Noise on my 70 with new muncie

Quote:
Originally Posted by Billdini View Post
I am confused. You keep talking about balancing the clutch to a flexplate. Flex plates are for automatics and I assume you are calling your SFI rated flywheel that you bought which BTW is for an internally balanced small block. The 400 SBC and 454 BB use an externally balanced flywheels so if you are using the part number Summit 700180 on a 400 or 454 its wrong. Am I missing something here?

Bill,
I am pretty sure what he meant was that he had the new flywheel and clutch assembly balanced to match the flexplate that he was using with the automatic. This actually is a completely normal operation especially if the flexplate was modified in any way during the original engine balancing.



Like I stated before if he is not feeling the vibration when running the engine in neutral then the problem is not in the engine/flywheel/clutch.

Bill Koustenis
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post #28 of 37 (permalink) Old Oct 19th, 19, 11:26 AM
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Re: Noise on my 70 with new muncie

Quote:
Originally Posted by BillK View Post
Bill,
I am pretty sure what he meant was that he had the new flywheel and clutch assembly balanced to match the flexplate that he was using with the automatic. This actually is a completely normal operation especially if the flexplate was modified in any way during the original engine balancing.



Like I stated before if he is not feeling the vibration when running the engine in neutral then the problem is not in the engine/flywheel/clutch.
Thanks Bill. I have always been an internally balanced guy but even then I always balanced clutch and flywheel with the rest of the rotating assembly. Didn't know you could balance a 30 pound flywheel and put it in balance using a much lighter flex plate. Live and learn.
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post #29 of 37 (permalink) Old Oct 19th, 19, 4:53 PM Thread Starter
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Re: Noise on my 70 with new muncie

Bill, you are correct. That is what I had done,however Iím reading some post alluding to the fact I might have installed the wrong flywheel. The driveshaft was out of balance. Iíve reinstalled and no low speed( mph) vibration. I do have vibration at the higher speeds aron 60-70 mph. Also the noise when I release the clutch is there but only after car has warmed up. Shifts perfectly. I might have to pull the whole thing. The noise points to a input bearing on the m22 but it has less than 100 miles on it. Donít ant to change the bearing until I find out why it failed
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post #30 of 37 (permalink) Old Oct 19th, 19, 4:58 PM Thread Starter
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Quote:
Originally Posted by Robinls5 View Post
Is the driveshaft a " 3-R " shaft?
Bob
Iím playing stupid here. Not sure what a 3-r shaft is. Itís a shaft where the tube is larger for the main length than the ends. Iím sure itís the original.
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