Low pitched noise/resonance from drivetrain(?) - any ideas?

[Boston X5 4.4]

Wonder if it could be worn guibo/flex joint, u-joint, or differential bushings? ...all could cause driveline vibration

[julezw]

I'm going to get diff and X case fluids changed and have a second attempt at diagnosis this time with a new indy mechanic.......as dealer couldn't diagnose it, surprise surprise. I'm also contemplating a partial tranny oil change.

I'm starting to get worried as the noise is getting worse. Its also embarrassing sounds like I'm driving some crappy van/ truck that is on its last legs I'm contemplating being loose of this car as I have had to spend lots of dough recently and if this turns out very expensive its time to part with the X. Will see.

[tmpE86]

Originally Posted by julezw

I'm going to get diff and X case fluids changed and have a second attempt at diagnosis this time with a new indy mechanic.......as dealer couldn't diagnose it, surprise surprise. I'm also contemplating a partial tranny oil change.

I'm starting to get worried as the noise is getting worse. Its also embarrassing sounds like I'm driving some crappy van/ truck that is on its last legs I'm contemplating being loose of this car as I have had to spend lots of dough recently and if this turns out very expensive its time to part with the X. Will see.

Ever find a solution to your problem?

[x5sportman]

Originally Posted by julezw

I'm going to get diff and X case fluids changed and have a second attempt at diagnosis this time with a new indy mechanic.......as dealer couldn't diagnose it, surprise surprise. I'm also contemplating a partial tranny oil change.

I'm starting to get worried as the noise is getting worse. Its also embarrassing sounds like I'm driving some crappy van/ truck that is on its last legs I'm contemplating being loose of this car as I have had to spend lots of dough recently and if this turns out very expensive its time to part with the X. Will see.

I had the same issue and tried the loading turns which didn't change the sound significantly. Finally used a mechanics stethoscope with the truck on a lift and isolated the left front bearing as the culprit. Had it replaced, and now the X feels and sounds like a new ride. Love it.