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Drive line vibration


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The brown one is stock 59 Pontiac, two black ones are from the 62, with new slip joint. It looks like all the new drive shafts are phased all in line as newer trucks etc. Found from Google search that the 90* phase works because cruise rpm is 2300rpm up with over drive rpm is about 2000 or little less. The explanation was related to the number of power impulses per revolution!  At faster speed it is 4/rpm in overdrive goes down to 2.6, engine now working harder and not as smooth (www.superchevy.com/how-to/engines-drivetrain/0205sc-vibrations/) where i found this. Original 90* phase going in, change latter if needed  Laurie 



-- Edited by Teich on Saturday 4th of February 2017 09:56:36 PM



-- Edited by Teich on Saturday 4th of February 2017 10:08:55 PM

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Update on the drive shaft phase of 90*. Went to machine shop today was going to cut shaft and phase at 180* Loyd said NO it may vibrate-- said he got caught with that long time ago on Chevy 1/2 ton became a redo. Laurie

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