The KDJ indicator is derived from the Stochastic with the one difference being the addition of the J line. This implies that the KDJ indicator has a total of three lines; %K%D%J. The %J is simply put, the difference between the %K and the %D lines, which is similar to the MACD.
The difference between the %J and that of the MACD is that it is plotted as a histogram and the second being that the value are weighted and as such delivers more emphasis on the shorter term %K line.
What we now have is a line that moves quite slowly and has the knack to move beyond the range of a normal stochastic indicator.