The McCormick 6690435A1 is a genuine OEM drive shaft designed for a wide range of McCormick X-series tractors. This essential component ensures reliable power transmission within the machine's drivetrain. It is compatible with McCormick X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.80, X4.90, X5.20, X5.30, X5.40, X5.50, X5.60, X5.70, X5.80, X5.90, X6.30, X6.40, X6.50, X6.60, X6.70, X6.80, X7.40, X7.50, X7.60, X7.70, X7.80, X8.40, X8.50, X8.60, X8.70, X8.80, X8.90, X9.40, X9.50, X9.60, X9.70, X9.80, and X9.90 tractor models.