Mine does that. Its probably due to the TOD 4wd system since it's essentially a Full-time four wheel drive unit. The front is powered and during a turn will follow a different path than the rear so there will be something that gives, in this case the front tires breaking lose lightly from the road and causing the sound. Does that make sense? If I'm wrong please someone let me know but this is always the reasoning i used when i hear it and i'm fairly certain its correct.