So, it was minus 10 degrees celsius last night and I was showing my bike to a friend from the south when I ended up facing downhill on a snowy slope. I had to backup due to a big rock sitting in the middle of the trail... I put the bike in 4wd (I think the front axles were loaded up, as I was on the slope) and heard a hugh bang!!!! sounded like it went into 4wd HARD! seems to work, but now i'm paranoid about my front diff... should I be concerned?