Think it was just transmitting the noise strangely.

SOLVED!!!!!!!!!!!!!!!!!!!
If I had just listened to my gut instinct in the first place and changed the LEFT REAR wheel bearing like I had originally thought, I wouldn't have had to go through all of this anguish. After a FULL day of carefully cutting the old wheel bearing off of the CV shaft (what a ...

Drove the XC90 into work today, gonna take it for an alignment after all of the suspension work I've done....listened/Felt that vibration the whole way in, trying to narrow it down, it definitely feels like it's originating in the rear of the car....COULD it be the rear differential??? Have those ...

Ok, here is an update....THE VIBRATION IS STILL THERE!!!!
But, I took everything apart on the Left Rear, felt the new wheel bearing and it felt like there was a little "hitch" in it when turning it in my hands. So, to be safe, I got another new one and replaced it. At the same time, I replaced the ...

OK, Update.....pulled the drive shaft off today and inspected the front CV Joint....I was hoping to find an obvious problem like all the grease dried up or rust or something...but found nothing suspect. There was plenty of grease in there and no rust etc. So, I repacked it, put everything back ...

I know it's been a little while since your post, but I wanted to add my experience which might help others. This winter my '06 XC90 had the EXACT same problem and totally wiped out one of the idler pulleys along with the boss on the timing cover. I panicked!!! After examining it for a while, I ...

Thank you.....That's awesome info. I will dug into it this weekend and report back.

I've heard that those joints are problematic because of the heat from the CAT. I think I will pull the drive shaft this weekend and check it out. Do you think I should gamble on just repacking it....or replace the joint?

Hi All,
Have been searching all over the place for help with this problem and really need some good advice, I'm stumped.
We have a 2006 XC90 V8 with 95k miles on it. It's my Fiance's car and she drives it daily....I'll give you a little background...
A couple of months ago while doing routine ...