4WD Gearbox Coupling for International Harvester 485, 745, 856, 956 XL Series Tractors SKU: QT4971

When your 4WD engagement becomes sluggish or fails completely, a worn gearbox coupling is often the culprit. This 23-spline coupling restores positive engagement between your tractor's front and rear drivelines, ensuring reliable 4WD operation when you need maximum traction for heavy field work or challenging conditions.

Why Precise Fit Matters

• 23-spline design matches original International Harvester specifications exactly
• Heavy-duty construction handles the torque loads and shock forces of 4WD operation
• Precision-machined splines maintain engagement integrity under load
• Direct replacement eliminates compatibility concerns with your existing driveline

Your International Harvester 485, 745, 856, and 956 XL series tractors rely on this coupling for seamless power transfer to the front axle. Whether you're pulling implements through heavy soil or navigating steep terrain, dependable 4WD engagement keeps you productive when traction becomes critical.