This is an aftermarket RC gearbox height adapter engineered to work with YZ-4SF standard parts and the B-YZ4SF chassis layout. It secures to both ends of the gearbox at the bulkhead so you can alter vertical position without cutting or modifying the chassis or gearbox shell.
Moving the gearbox up or down changes the angle between the universal shaft and the suspension arm / upper arm. Those geometry shifts are an effective way to dial traction and turn-in behaviour via drivetrain alignment rather than by changing springs or damping settings.
Fitting is straightforward on compatible bulkheads: place the adapter on each gearbox end and fasten into the existing bulkhead mounting points, keeping the assembly serviceable with standard RC maintenance.
Copyright © 2008-2026 rcjaz.co.nz All rights reserved