Servus, I have an audio 80 quattro and on the internet I read “… The locks can be switched on and off both in stand as well as during the ride…” but as far as I know, you should only turn the lock on in stand still or not on spinning wheels, because if the wheels turn differently fast and then that diff is locked there can be damage or not??? if someone is shit, please say because during the ride to lock n would have been sent to me many times ;-)))) mfg harry