Originally Posted by
B.A. Racer
The diff balls need to grip the diff ring to work efficiently.if the diff rings are not sanded, the diff will slip and therefore be less efficient. Roughen the diff rings with sandpaper to create more grip for the diff balls. What you were saying about the area on the ring keeping contact with balls is false. If the ring is at all polished, the balls will slip, which will make you tighten the diff more. And when the Balls have something to grip earlier, you will have a looser diff with the same results. There has been much research about this, and sanded diff rings result in the best outcome.
I will say this sanding diffs has not been practiced near as long as diffs have been working with out sanding them. Would I polish a diff? No. At least not to a smooth non porous finish. I have tried I think every method ever talked about or seen at the track. Even gluing the ring to the out drive.
In the end to each his own but I am sticking with the non sanded stock ring method. I have had the best success this way.
I think its better and many disagree. Believe me we go threw this at the track often... Grrr!
But I don't think false is quite right, but I am not the wizard by far.