On certain motorsport events which include vigorous stopping and starting it is possible that the diff pin will wear badly or even break,this is due to the uneven load applied by the varying tolerances and poor machining of the planet gears.This kit is the ultimate way of stopping play in the diff which causes wear.Made for any use and especially when competition regulations do not allow the use of a Cross pin or LSD differential unit.The kit contains 2 specially bushed planet gears with thrusts,diff pin and a new securing roll pin.