The large diff balls are the same size as AE balls (3/32), but the thrust balls aren't the same (1/16). As stated above, they are regular steel and will wear faster. Especially if: 1- You didn't break in your diffs before your first run with them, 2- You didn't surface your diff rings 3- You overtightenend your diffs or 4- You ran the diffs too loose. I believe #3 and 4 are the major diff killers...
I used Yokomo Tungsten carbide balls to rebuild the diffs (a pack of 12x 3/32 was 11$ US I believe) both for the diff ring balls as well as the Thrust bearings. I also believe ACER racing has free international shipping these days for their bearings. You can give them a look...
You can flip the diff rings and use the other side if there is a deep groove in them. But if the balls now have a flat spot in them, they are toast. try rebuilding them like this and turn them by hand. You'll know if they are toast because they will be notchy.
Good components (hardened diff balls)+ good diff building(surfacing+ break in)+ proper adjustment = long lasting diffs!
Hope this helps a bit!
