The McCormick 4218191M2 is a genuine OEM transmission shaft designed for a wide range of McCormick X-series tractors. This critical component ensures efficient and reliable power transfer within the drivetrain, maintaining optimal performance. 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, X6.420, X6.430, X6.440, X6.460, X6.470, X6.480, X6.490, X7.440, X7.460, X7.470, X7.480, X7.490, X8.660, X8.670, X8.680, and X8.690 models.