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Old 06-11-2007, 11:51 PM   #1
crm318
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what does a cracked flywheel sound like

i have been having a metal on metal contact sound coming from the flywheel area. its louder in the beginning of a gear and lightens up and then gets loud as it shifts into the next gear. is this a cracked flywheel sound?
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Old 06-12-2007, 12:12 AM   #2
CrashEd
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Re: what does a cracked flywheel sound like

Pull the cover and make sure its not the torque converter bolts if there tight you should beable to look with a flashlight and see a crack around the crank.
Ed
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Old 06-12-2007, 03:32 PM   #3
bigtruck81
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Re: what does a cracked flywheel sound like

a cracked flexplate sounds like a lower end knock, ive heard some that sounded like main bearings,others sounded like rods. TC bolts typically sound like rods.,
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Old 06-12-2007, 06:16 PM   #4
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Re: what does a cracked flywheel sound like

I agree. Mine sounded like a rod knocking, so I got a crate 350 to replace a 305. After removal flexplate was cracked at crank bolts. Anyway, I got a 350.
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Old 06-12-2007, 11:30 PM   #5
crm318
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Re: what does a cracked flywheel sound like

well i got under the truck and inspected it with a flashlight. i couldnt see any cracks, however it might be cracked around the crank and not the bolts.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 06-12-2007, 11:44 PM   #6
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Re: what does a cracked flywheel sound like

I agree, I have heard them sound just like a rod knocking.

Hope you get it figured out.

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Old 06-13-2007, 12:21 PM   #7
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Re: what does a cracked flywheel sound like

it sounds like a dryer with a hand full of pennies. it is loudest at the beginning of each gear.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 06-13-2007, 08:33 PM   #8
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Re: what does a cracked flywheel sound like

Are you sure it's the transmission? I've heard pebbles in the catalytic converter heat shield described as you have.
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Old 06-14-2007, 12:20 AM   #9
crm318
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Re: what does a cracked flywheel sound like

i dont have any emissions stuff. my truck is a 72 cheyenne.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 06-17-2007, 08:57 PM   #10
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Re: what does a cracked flywheel sound like

Maybe broken vain(s) in the torque convertor?
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Old 06-18-2007, 01:30 AM   #11
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Re: what does a cracked flywheel sound like

Quote:
Originally Posted by RACINJASON22 View Post
I agree, I have heard them sound just like a rod knocking.

Hope you get it figured out.

RJ22...
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Old 06-18-2007, 02:20 PM   #12
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Re: what does a cracked flywheel sound like

had the same problem with my jeep thought it was carbon balls in the cat so i took my handy dandy angle grinder and removed it for some reason I couldnt find any wrench or socket that would fit the bolts. anyway got it put back together without the cat and still had the noise. pulled the trans one day to fix a leak got to looking around and found the crack.
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