The more diff balls you can use the less you have to tighten the diff to get the same action. This results in a smoother diff that lasts longer. CRC has a new spur gear that uses a smaller diff ball to get more in the same area and it works quite well. You will have to add spacers to that side of the axle though to keep the back end centered properly. Xenon makes a spur gear now that has as many diff balls but still uses the standard 1/8th diff balls. I've tried the CRC ones and like them a lot but picked up some of the Xenon ones at the IIC to give a try as well.