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Just joined this group and I’m hoping that someone can help me out. We have a 2012 AWD that had a high frequency vibration under acceleration at speeds between 40 and 70 mph. First, I checked the driveshaft. It had one stiff ujoint and one with some play. As some of you may know, the driveshaft is not serviceable. So, I replaced it and some of the vibration went away. I researched the vibration under acceleration and found several sources that said that the vibration is coming from a CV joint. The right front wheel bearing was noisy, so when I replaced it, I also replaced the left front bearing and both front axle shafts. The vibration seemed to get better, but was still present. I finally replaced both rear axle shafts and both rear wheel bearings. Got a bit better, but still have a vibration under acceleration around 50 mph. Any ideas? One other thing, I even had the new driveshaft checked for balance.
 
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