Recommendation: .Axles: If you choose YUE ONE V2, we recommend using the Axial Capra Axles(VP version) (check image), please select the GearBox with a mounting hole of 38mm. .GearBox: Recommended Rhino GB867 GearBox .Shock absorber: It is recommended to use the RhinoCrawler S095 shock absorber, 0.9NUMBER spring for the front shock absorber and 0.8NUMBER spring for the rear shock. .Power System: Recommended to use Rhino VE40A & Rhino RM-S12 Brushness motor .Battery: recommended to use 850mAh .If you choose our YUE ONE V2 version, you need choose Axles based on your Gearbox (Notice: the Chassis support 38mm GearBox installation hole). In fact the YUE ONE V2 chassis can be used for all axles, but the length of the pull rod needs to be customized by customers. .When you order YUE ONE V2 and Capra Axles(VP Version), recommended Drive Shaft (2pcs 65-81mm, 1pcs 101-154mm) and Rhino Transfer Case for you. .Battery: Recommended to use 850mAh