you could always try the NEW elcon diff.....its great. its a sealed diff... the gears sit in oil
This new differential is provided with spiral bevel gears. Because of the sliding contact that these spiraled gears make their contact pressure is higher and the forces are divided over at least two teeth at all times.
This results in a much stronger differential that is resistant to the large forces that are imposed on the differentials, especially in off-road racing. The differential is a closed system which is filled with approximately 10-12ml of oil. The differential is delivered assembled and pre-filled