Quote:
Originally Posted by pggto
The mounts are new, I put in the polyurethane motor mounts from Bulter and the trans mount was replaced a few years ago and is still in good shape. This vibration is definitely rotational due to the harmonics that I feel. I was an auto mechanic for 10 years and have fixed my share of vibrations, but this one has me stumped.
Maybe the reason its worse now with the new engine is because of the stiffer motor mounts, but that still doesn't explain the cause.
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Get a syrometer (sp) and find out what HZ you get at what RPM or vehicle speed. From there you should be able to calculate what it is.
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1971 Pontiac GT-37
Car is a junk yard dog and maybe one day will be restored.
