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Old 04-19-2011, 05:03 PM
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Engine vibration when parked and on the highway

Hello to all,
I have a 1964 Impala SS HT327/th350 combo. I'm having a vibration that I can feel when I'm on the freeway as well as when the vehicle is parked. A few weeks ago I swapped the Powerglide and converter with th350 and a newer converter. During that sap I had the drive shaft balanced and shortened to accomodate the new tranny. I thought this would fix the vibration but it did not. Since the vehicle vibrates in park and neutral I suspect that the culprate is somewhere between the Flexplate and Harmonic balancer. My question's are:

How do I figure out id my engine is externally/internally balanced?
Do I haver the correct balancer?
Do I have the correct flex plate?

I should note that when I purchased the vehicle the engine was rebuilt by someone. Also, the motormounts checked out as good.

Please help.

Thank you

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Old 04-19-2011, 05:17 PM
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The SBC engine are all internally balanced except for the 400. Is there a counter weight on the flex-plate ? And look at the balancer you might have to remove it flip it over and see if it is also counter balanced .JMO
You might also want to check and see if the balancer has come loose.


Cole
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Old 04-19-2011, 06:54 PM
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I would also check to make sure the top of your trans housing isn't hitting your floor pan or anything else. I had the same problem and my floor pan tunnel was just touching my trans housing. I wedged a crowbar between the top of the housing and the floor and tweaked it a little, the vibes went away.
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Old 04-19-2011, 06:57 PM
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Cole,
I have not checked the flex plate. Can you tell me what to look for? Also I had a mechanic take a look at the balancer and he said it was fine.

Thanks
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Old 04-19-2011, 06:59 PM
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41PU,
I'm sure that bellhousing is making contact. I had to jack the tranny all the way up to get it to fit when I mounted it. This is something else I will check.

Thank you
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Old 04-19-2011, 08:39 PM
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Quote:
Originally Posted by sandiego8511
Cole,
I have not checked the flex plate. Can you tell me what to look for? Also I had a mechanic take a look at the balancer and he said it was fine.

Thanks
Here's a pic with a external balanced flex-plate and balancer. you will notice the weights on both. Now the weights may not be very large could be smaller then the one in the pic, And as stated check for clearance that nothing is hitting anywhere causing the vibrations you feel.


Cole
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