Torque is divvied up by a compoundplanetary gearset; when slip is detected, an electronically controlled clutch increases or reduces the friction between the two ring gears to change the front - to - rear distribution.
A unique combination of a conventional five - pinion planetarygear set and a compound Ravignaux gear set — known as a Le Pelletier arrangement — makes the AF40 - 6 very lightweight and compact.