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Old 08-09-2011, 03:46 AM
RoadSide Dan RoadSide Dan is offline
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Harmonic Vibration

What's the correct pinion angle for a 9" Ford rearend?

My '53 Chevy 3600 had a 9" Ford offset rear end and a two piece driveshaft. It ran pretty smooth at that time.

While doing a frame-off restoration, I decided to convert to a single piece driveshaft and set the rearend angle more in line with the driveshaft. Converting to a single piece driveshaft and resetting the pinion angle to 3 degrees has resulted in a bad harmonic that starts about 35 mph and increases with speed.

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