Losi 8b diff gears

[SpEEdyBL]

I've had my 8ight for over two years now and neither of the gears inside or out of the diff have shown any wear, and neither have i ever used shims. Are you talking about the gears inside the diff or outside? If it is on the inside, make sure your diff has a enough diff fluid. If its on the outside, its probably the blown bearings that cause it.