401592 Geardiff V3 composite
401594 Diff gear 10T+18T for geardiff V3 composite (4+2
The Eryx 411 geardiff has been improved with new shaped composite gears to make the whole differential feel smoother. The changes to the tooth profile are only small, but make a big difference as you will notice instantly.
This same geardiff is standard in the Project 4X car too and the new gears were in the kit since the start.
Current Eryx 411 drivers only need to update the new internal gears as the case remained the same, but the performance will be even better if all is new.