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I saw that while I was doing research, but dismissed it since this vibration came on rather quickly without any changes to the truck. Had I lifted it, or had previously disassembled something, I could see either driveline angles or phasing being possible causes, but it has been fine for 20+ years and nothing has been apart. I did make sure I marked everything before taking the driveshaft apart, so the phasing didn't change.


Might still want to measure the shaft and flange angle. With more vibes under power and it goes away while coasting that may be telling you that the pinion flange is angled up too high. Why is this? Pinion will tip up (higher) under load due to the springs twisting upward and when coasting the pinion will drop back to it's rest angle. Might be it is right on the "hairy" edge, fine while coasting but with a few degrees of up-tilt under load, it may vibrate.

r.c.brown@ieee.org
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