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I have a cracked flex plate. Can a crack flex plate make a motor knock or make it sound like it's knocking?
 

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I have had a couple crack on me they do sound like that also when you take off and let off the gas. They will clatter and grinds when you start the engine.
 

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One way to check,is put it in gear,hold the brake and bring rpms up a little,do this in forward and reverse,most of the time if its a flex plate (flywheel) the sound will change,if its a rod again (most of the time) the sound will not change,
 

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they can make a knocking noise,its usually a tinny knocking and will sometimes go away in gear.
 

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Yes it will make it knock...
Mine was cracked all.around and i still took it to belton last year and whooped up on everybody...cheers
this year was fsstest small.block 2yrs running...:beer:
 

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Is it a ticking similar to an exhaust leak? I was hoping that's all I had but after listening it sounds more like the flex plate is shot. It's louder under load forward or reverse than at idle.
 

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TrannyMike
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Yes it will make it knock...
Mine was cracked all.around and i still took it to belton last year and whooped up on everybody...cheers
this year was fsstest small.block 2yrs running...:beer:
That wasn't the brightest idea. You wouldn't be bragging if you broke it and damaged you trans pump and got towed home. :poke:
 

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That wasn't the brightest idea. You wouldn't be bragging if you broke it and damaged you trans pump and got towed home. :poke:
nope i wouldnt but i did so i am:poke:and plan on doing so next year as well:poke:so bring yours, i am a equal oppoturnity whoop ass man wnen it comes to putting trucks back in the pits and on the trailer so bring it :poke::beer::texas:
 

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as u see that will make a knock sounded like it was coming apart
but a new one solved the problem:beer:
 

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Saw this on another board for possible rattle cause:

Without being there, it's obviously hard to say, but here's what I have had rattle in the past, only in gear and not in park... Catalytic converter (seems the lower rpms of being in gear made the rattle, but it was bad), Loose bolt on the transmission dust cover, loose linkage for trans selector.
 

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TrannyMike
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If you can't see it when the converter cover is pulled, then take the 3 converter bolts off, PUSH THE CONVERTER INTO THE TRANS, then start the motor. You will then find out without a doubt if it's the plate. It might still make a noise but it will definitely sound different if that's the problem. :beer:
 

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Well I dodged a bullet and lucked out with just a header gasket leak. The lousy ones that came with the headers (Hedman) lasted just 3 years. The trusty 3' piece of heater hose aka stethescope located the problem.
 
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