I'm new to the Titan family and had a few tech questions. I have an 05 cew cab and was wondering how to check the front differential fluid. I can't seem to find the check bolt? Also when I peel out on icy roads I can hear a slight grinding noise coming front what seems to be the front differential of brake master cylinder, is this normal? Aslo I dont have the off road package but was it is 4 wheel drive, do I have a differential lock? If so How do I engage it? Any help on these questions would be awesome!