On tractors it's pretty simple. 4X4s or 4 wheel drive are generally considered to be large full time four wheel drive intended for heavy tillage work on large acerage. MFWA (mechanical front wheel assist) looks pretty much like a row crop and has on demand front wheel assist on most models with other being full time or hydraulic drive and are just FWA. They are able to do row crop work like cultivating.
On cars and trucks 4x4, 4WD or any other discription is any vehicle able to drive on all 4 wheel including on demand, full time and auto.
Hope this helps.
Rick
This post was edited by oldtanker at 08:12:01 09/14/11.
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