High speed driveline vibration?

[drrust]

I had some of the washers in my glove compartment. The lighter one weighs 0.9 grams (0.9059) and the heavier one weighs 1.77 grams (1.7694).

The tubing was 3/8” air hose.

[RocketyMan]

Originally Posted by drrust

Here’s a thread that goes into detail on the issue

https://www.m3post.com/forums/showthread.php?t=1231461

Thank you for supplying that!

[gkgsvensson]

UPDATE: All wheels were found to be out of balance, and it was confirmed there were no markings on the diff flange. Diff fluid was flushed and wheels road force balanced. The result is that 80% of the high speed vibration is gone, but the NOISE and a *slight* vibration still exist. Its possible that the diff mounts are shot (original and been through 12 winters with 108k), its also possible the driveshaft is a culprit. However its not so significant as to warrant any changes for now. I plan to completely refresh the rear end with new subframe bushes, rebuilt diff, and control arms next year. I will update this thread with the results