New light weight 45T spur gear for use with smaller diff for the center(Same as front and rear diff). By using the smaller diff, accelaration will be quicker and smoother. Smoother deaccelaration can also be achieved. This spur gear is design to fit the smaller diff case replacing the stock diff housing which is larger. Requires the use of IF403B Diff case set. Compatible with MP10/9 series.