If you want OD your rigs, RhinoRC support Hardened Portal Gears by 40CR material, Nitriding and hardening treatment!
RhinoRC Capra Axles default Gears:
Front and Rear axles:
Portal gear: 12/23T
Diff gear: 8/24T
Please check the sheet which do you want to use:
Package inluded:
2 * 15T Gear
2* 20T Gear
2 * Steel Shaft