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Re: 400 bb vibration
[Re: Nick Mineau]
#181209
01/02/09 01:21 AM
01/02/09 01:21 AM
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Joined: Dec 2003
Posts: 22,715
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,715
Bitopia
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Before others chime, are we certain its an engine vs drivetrain vibration, ie, is vibration present when reving over 2Krpm in nuetral when sitting still? A OEM 400 is an externally balanced motor, so can you see if the correct vibration dampner is installed on the rebuild for a 400? but I am not certain on the dampner and consider this a bump.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: 400 bb vibration
[Re: jcc]
#181210
01/02/09 01:25 AM
01/02/09 01:25 AM
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Joined: Jan 2003
Posts: 18,426
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,426
UPPER MICHIGAN, MARQUETTE COUN...
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Quote:
Before others chime, are we certain its an engine vs drivetrain vibration, ie, is vibration present when reving over 2Krpm in nuetral when sitting still? A OEM 400 is an externally balanced motor, so can you see if the correct vibration dampner is installed on the rebuild for a 400? but I am not certain on the dampner and consider this a bump.
Plus the converter, Best to identify the crank and see what it needs to balance it .
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Re: 400 bb vibration
[Re: Nick Mineau]
#181212
01/02/09 02:16 AM
01/02/09 02:16 AM
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Joined: Jan 2003
Posts: 683
CENTRAL MINN
1965_PLYMOUTH
mopar
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mopar
Joined: Jan 2003
Posts: 683
CENTRAL MINN
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Quote:
it is present in neutral. how do i check for the correct damper. is it possible someone bolted the converter on wrong?
converter will only bolt on one way. check to make sure the correct torque converter was installed. 2 weights side by side. is it an auto tranny or manual? also make sure all cylinders are firing, and plug wires are on to the right firing order.
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Re: 400 bb vibration
[Re: 1965_PLYMOUTH]
#181213
01/02/09 02:28 AM
01/02/09 02:28 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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My 440 had the same nasty vibration after the rebuild, turns out i didn't have the converter WITH the weight welded to it. It is a cast crank so the off balance converter was needed. Find out what year the motor is and make sure it has the required weight for the converter.
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Re: 400 bb vibration
[Re: Nick Mineau]
#181215
01/05/09 01:30 AM
01/05/09 01:30 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I would not assume anything. Any of these cars especially as old as they are, can be built of mismatched parts. You might have the wrong converter and dampener both.
Don't discount stuff like fan belt(s) bent pulleys and bad water pumps/ AC compressor, etc. That's easy to find. Simply remove the belts and try it for a minute or two Use your head. If the thing vibrates in neutral, obviously it's not driveshaft, rear, etc, etc.
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Re: 400 bb vibration
#181216
01/05/09 03:24 PM
01/05/09 03:24 PM
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Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
Fishmarket
enthusiast
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enthusiast
Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
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I bought a car with an internally balanced 383 with the same vibration. Took it apart and it had a 400 cast crank thrown onto it. Wrong damper etc. I'll never forget the guy's name that I bought that one off. 
1972 Plymouth Cuda 340 4 speed
1971 Plymouth Road Runner 383 Auto
1970 Plymouth Duster /6 Auto
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