- CNC Lower Main Gear Set 106T: TREX 450X/XL
- CNC Main Gear LT w/Auto-Rotation Hub: TREX
- Main Gear - 3DXL
- Main Gear: Stinger 3,6
- Alloy Main Gear Hub - NR3D
- Hornet Main Gear, Conical Teeth
- CNC Main Gear: BCP/P
- Main Gear/ Autorotation Assm: V
- Main Gear - NR3D
- Inner Shaft with Hub & Main Gear Set: BCX
- Main Gear/One-Way Bearing Case: 600A, CF
- CNC Lower Main Gear Set 109T: TREX 450X/XL
- X3D Hornet Main Gear
- Main Gear w/Auto RHb: TREX 450X/XL/SE
- CNC Lower Main Gear 106T: TREX 450X/XL
- CNC Main Gear w/Auto-Rotation Hub: BCP/P
- Inner Shaft Main Gear: BCX
- Outer Shaft & Main Gear Set: BCX
- CNC Lower Main Gear 109T: TREX 450X/XL
- CNC Main Gear: TREX 450X/XL/SE