Originally Posted by
5th wheel
Yes new b4.1 wc.the case was dusty in side but the diff looked ok just dusty. I guess. But I clean it all out and rebuild the diff
Dust and dirt INSIDE the tranny is not normal. Are you racing it or driving it on the beach? I would tear it down and clean it. I am not sure how it is getting in. Even when I race on a dusty track the inside are never dusty. you can try to seal the tranny with a very light amount of grease where the tranny halves connect. but you might want to explain what type of surface you are racing on.