Intelligent Variable Torque Management for all Four Wheels (i - VTM4) This entirely more capable system progressively distributes optimum torque between the front and rear axles and, for the first time in a Honda vehicle, dynamically distributes engine torque between the left and right rear wheels using the new, lightweight rear drive unit. (greencarcongress.com)
The MDX SH - AWD ® rear drive unit is constantly overdriven by 1.7 - percent and the resulting overdrive effect is regulated by left - and right - side electromagnetic clutch packs within the rear differential that independently control the power delivered to each rear wheel. (topspeed.com)
The entire system is apparently based around a so - called Rear Drive Unit (RDU), which consists of twin electronically controlled clutch packs that also act as a limited - slip differential. (topspeed.com)