Tag: driveshaft

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Why Were Gen 1 AWD Systems so Delicate?

There are a few different systems.
Gen 1 that is the 850 platform is the delicate one.
Gen 2 2001-2002 XC70 is less so but still needs care.
All others since then are very low in problems other than a pressure/temp sensor that has been updated.

The front drive connection to rear drive is via wavy discs splined alternately to input and output with a silicone gel, viscous coupling, VC.
There is also a one way clutch in the VC that is overridden up to approx 30 mph so you can have power to rear wheels in reverse.