What does 4-WD stand for?

MLA style: "4-WD." Acronym Finder . 2012. AcronymFinder.com 22 May. 2012 http://www.acronymfinder.com/4_Wheel-Drive-(4_WD).html
Chicago style: Acronym Finder . S.v. "4-WD." Retrieved May 22 2012 from http://www.acronymfinder.com/4_Wheel-Drive-(4_WD).html
APA style: 4-WD. (n.d.) Acronym Finder. (2012). Retrieved May 22 2012 from http://www.acronymfinder.com/4_Wheel-Drive-(4_WD).html

4-Wheel Drive

This definition appears very rarely

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Samples in periodicals archive:

Just as in real life, the 4-wheel drive model allows for driving over areas that are rougher or steeper than the 2-wheel drive model could handle.

If your Stryker is moving slow, you can shift from 4-wheel drive to 8-wheel drive high (and back again) while on the fly.