Tag: CV joint

Axle clicking sound? What to do, and when to do it.

Axle Death Click Click Click

Are you hearing a click sound from your front wheels? That’s the CV joints dying. They exist on front-wheel drive and AWD vehicles so that you can turn your front wheels. It’s a way — “articulation” — to get power from the engine to the wheels. You can either replace the axles (“half-shafts”), or if it’s not too late, you can re-grease and re-boot your existing axles.

MVS logo - fist holding a wrench

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.