GEAR LH

The Left-Hand Axle Gear (C5NN4239A) is a mission-critical drivetrain component engineered to restore the pulling power and mechanical efficiency of your classic Ford tractor. Replacing OEM numbers C5NN4239A and 1803441, this gear is designed to handle the rigorous demands of professional agricultural machinery, providing reliable power delivery from the differential to the left-side axle shaft.

In tractors with thousands of hours of service, axle gears are the primary interface for transferring engine torque to the ground. Over time, original gears can develop pitting, tooth fatigue, or spline wear, which leads to "slop" in the drivetrain, audible noise, and potential failure under load. This high-strength replacement gear provides the precise tooth geometry and structural rigidity needed to restore factory-standard performance and handling.

Targeted Compatibility: Specifically engineered to fit a wide array of Ford tractor models. By choosing an OEM-quality replacement, you are ensuring that your differential remains stable and responsive, significantly reducing the risk of catastrophic drivetrain failure during critical planting, plowing, or harvesting tasks.

Built for strength, balanced rotation, and maximum service life, this farm equipment replacement part helps maintain the integrity of your tractor's vital internal systems, ensuring your machinery performs consistently and safely under all load conditions.