Xray introduce the 40T active front differential for the XB9 off-road buggy. The adjustable gear diff sports a special design with angled internal segments that let the unit engage more in on-power situations in order to increase forward traction and stability and to make the buggy faster and easier to drive. Read more and see photos of this gear differential via the source llink. Source: http://www.redrc.net/2012/07/xray-xb9-40t-active-front-differential
