this post was submitted on 24 Sep 2023
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Mechanic Advice

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I've been procrastinating a fix for a vibration that is speed related on my xc90. It starts around 45mph and comes and goes up to 65 or 70... I broke some stuff 'diagnosing' it, and once I fix that I'm going to take the awd driveshaft out. I'm assuming a bearing is bad, any ideas? I want to repair the driveshaft because it's really expensive to replace.

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[โ€“] mvirts 1 points 1 year ago

Im pretty sure the grease spray was old and dry

The vibration is low frequency shaking, no grinding, doesn't interfere with driving really.

I put a new lower control arm in on the left side today and it improved the handling issues some, hopefully when I do the right lower control arm it will be better. I noticed that the thing about torquing the bushings on the ground doesn't apply to this vehicle... so idk why they broke when I was breaking things before, maybe the bushings were on their way out anyway.

You do have me hoping that replacing the control arms may fix the vibration... hopefully I'll know soon!

Ah and I learned the hard way that when trying to get the ball joint in the control arm, if the knuckle has a mind of its own and gives you hell for an hour, make sure both sides of the vehicle are on stands so the sway bar isn't ruining your day ๐Ÿ˜… I'm so glad I got it done all at once, I've already scrapped one car because I left it taken apart for too long ๐Ÿ˜ฌ One is enough.

I definitely want to check my alignment at home, thanks for the info!

Good point I should check all the wheels...

I haven't gotten a good look at the joint in the drive shaft, which is part of why I want to remove it.

Thanks for the advice! It helps a lot