TRAXXAS TRX4 TRAIL CRAWLER Aluminum Center Gear Box 1 set - GPM TRX4038
Amazon.com: JOYSOG Metal 2 Speed Transmission Gearbox with Internal Gears Set for Traxxas 1/10 TRX-4 TRX-6 RC Crawler Car Upgrade Parts(Black) : Toys & Games
YEAHRUN Black Metal Transmission Center Gearbox Case 2 Speed for TRX4 TRX-4 TRX-6 1:10 RC Crawler Car Upgrade Parts
Amazon.com: Benedict Harry CNC Aluminum Speed Transmission Case Gearbox for 1/10 RC Crawler TRX-4 : Toys & Games
1Pc For 1:10 RC Crawler Traxxas TRX-4 2 speed Alum Metal Transmission Gearbox | Fabricating and Metalworking
Billet Machined Center Gearbox Housings for Traxxas TRX-4 Scale & Trail Crawler for R/C or RC - Team Integy
AXSPEED Metal Transmission Center Gearbox Case 2 Speed for 1/10 RC Crawler TRX4 TRX6 Upgrade
YEAHRUN Metal Center Transmission Case Gearbox for TRX-4 TRX4 TRX-6 1/10 RC Crawler
The Scaler Store - Traxxas TRX-4 Gearbox Fork Kit
Amazon.com: JOYSOG Metal 2 Speed Transmission Gearbox with Internal Gears Set for Traxxas 1/10 TRX-4 TRX-6 RC Crawler Car Upgrade Parts(Black) : Toys & Games