Ok I looked up some info on the actuator gear and found a video on youtube , at 1:10 min you can hear the sound of a shot gear. I have that exact same sound now but did not have it until I swapped for my 18's...The gear at Odometer Gears is 125$ and they specify the part wil not be covered under warranty unless given proof that all four tires be replaced at once. So now I'm thinking I have to change that gear (easy DIY) but will need to figure out if my winter setup is the cause of this gear failure ....Your thoughts on this?
Here is the vid :
2005 BMW X5 TRANSFER CASE ACTUATOR - YouTube