This is the most important upgrade for my 1/18 NRX-18 NANDA, previously my stock differential grinded its orbit gear and result low power transfer to overall wheels, i'm using brushless system. After upgrades to Atomic Ball diff my NANDA runs 60% more thrust power and top speed!!! excellent power distribution to the wheels and adjustable too to give proper slips. This is a must especially if you upgrade your motor system to brushless.
I don't know to what problems of assemblage it referred Luca.
I have climbed on it with extreme facility on a M18 RTR and it works to wonder.
It perfectly works with the Front One-Way Unit too and, above everything, they has eliminated the noises of plastic differentials.