This 3-gear transmission case is an RC-scale replacement part specified for the YZ-2CA family. The listing denotes left and right housings intended to mount into the standard 2WD off-road drivetrain, preserving the original gear layout and mounting points.
Fit and compatibility are straightforward: the case matches the YZ-2CA gearbox arrangement and the supported B-YZ2CA chassis variant. It is intended as a direct chassis-level replacement to restore drivetrain geometry or to replace a worn/damaged housing during routine maintenance.
During installation verify alignment of the spur gear and pinion mesh, check shaft seating and walk the drivetrain by hand before running the motor. The part plays a tuning role by ensuring consistent gear mesh and housing alignment, which affects drivetrain smoothness and predictable power transfer in 2WD off-road setups.
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