Originally Posted by
UN4RACING
Actually it does mater if you are anal about performance....
The rough edge left at the top of the groove will diminish and then your diff will begin to bark. Mainly due that the ring is not covering enough surface of the ball. The rough scuff marks are hell on a ball under force. It scars them as the diff wares.
Not trying to change the world or cure world hunger just pointing out some not so obvious things about the difference of sanding vs. not. Both options have a place as far as performance.
I believe non sanded are the best in performance.
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.