I saw that. I'm really thinking the excess yoke length is a contributor. If not, I'm out like 20 minutes work to cut it short.
I've encountered typical driveline vibes many, many times over the last 20+ years of doing this. This one is weird with the severity that occurs at such a specific speed and the fact that multiple angle settings has little to no effect.
That's what makes me think it's less an angle issue and more something else.
