The 6517977M91 is a genuine OEM gear designed for various McCormick and Massey Ferguson tractor models. This essential component ensures reliable power transmission within the machinery. It is compatible with a wide range of models including McCormick MC series and numerous Massey Ferguson 3000, 3100, 3600, 6100, 6200, 8100, and 8200 series tractors. Manufactured to original specifications, this gear provides durability and optimal performance.