Rear drivetrains in xc90?

[frontbumper]

Hello,

I have understood that from some year on, the spline sleeve problems have been tackled with an upgraded sleeve and someone even mentioned that some kind of chain drive would have replaced the angle gear.

Is there a way to tell (e.g. by year model, date of manufacturing, model specification etc.) if a particular xc90 has an improved sleeve or different arrangement here?

What about the Haldex solutions in the rear: which models/years had this Volvo tampered Haldex, which real Haldex and which the pre-pressurised Haldex?

Thanks