Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Sending power to every one of the vehicles wheels all the time, or only when needed, through active or non-active differentials or a transfer case.
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
