BFB buggy upgrades with differential

Because a plastic gears in original project can not withstand a lot of load from the 540 motor, I have made some modification for a chassis and insert the Feiyue differential. And now the buggy is standing full power but a suspension arms needed to reprint from SBS instead ABS. See my video with test run: https://www.youtube.com/watch?v=2s7V9TxbHRU This modification still uses the original plastic gearbox, which I made from PETG, and its connect to diff by Feiyue driveshaft. Also I use