This is a great replacement for your 500 class Helicopter
500 Class Lower Gear 145T
Trex 500 Autorotation Tail Drive Gear: Tarot 500 TL50019
Align Slant Thread Main Drive Gear/134T Align TRex 500 H50178QAT
500 Class Strait Cut Main Gear (White)
500 Class Slant Cut Main Gear (White)
Align Trex 600 Nitro Main Gear, Tail Drive Gear, and One Way Bearing. M
