The automobile differential is used to distribute power from the engine to the rear wheels , also to achieve differential speed in the inner and outer wheel when vehicle takes a turn. During taking a turn if one side of the road is slippery then only one wheel receives power and other wheel remains dead and vehicle cannot move forward ..this is slip of differential. The differential system available in semi-automatic mode or sensor based fully automatic mode will lock the differential and distribute equal power to the left and right hand wheels and thus the vehicle moves forward without having to push the vehicle externally or tow the vehicle. 18600/- ----with semi automatic mode