Nasty Vibration/Shudder @ ~3,200 rpm and above
September 21st, 2018, 04:33 PM
#1
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Nasty Vibration/Shudder @ ~3,200 rpm and above
Hello All. Looking for a little help troubleshooting my '70 442 with original 455 motor and th400 transmission. I get a nasty vibration/shudder at 3,200 rpm or above. The vibration/shudder begins at ~3,200 RPM and is present at highway speeds (in gear or neutral), low speed in 1st/2nd gear, and at zero mph in neutral. No vibration is present at lower RPM. Thus far I've replaced the drive-shaft and U-Joints, and inspected the damper which appeared to be in good condition. Any ideas regarding the potential cause(s) are greatly appreciated!
September 21st, 2018, 05:11 PM
#2
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If it happens in neutral or park it has nothing to do with wheels, tires or driveshaft. I would look into a missing weight on the flexplate or torque convertor as a first step, especially if it started out of the blue.
September 21st, 2018, 05:28 PM
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If it does it in neutral with no load it should be pretty easy to pin point. Have someone bring the r's up and look at the harmonic balancer, belts, brackets. If nothing found, unbolt the torque convertor and push it back in trans and see if it still does it.
September 23rd, 2018, 02:14 PM
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Thanks guys. The harmonic balancer, belts and brackets all look good. Next step is unbolting the torque convertor to see if the vibration is still present.
September 24th, 2018, 05:36 PM
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June 19th, 2019, 04:32 AM
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#10
I noticed that. I assumed he determined the converter was the issue by unbolting it from the flywheel. If he hasn’t removed the converter yet, try reclocking it.
Last edited by matt69olds; June 20th, 2019 at 09:59 AM.
June 19th, 2019, 10:30 AM
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