The 6660086A1 is a genuine OEM gear designed for McCormick agricultural machinery, guaranteeing precise fit and robust performance within the drivetrain. This critical component is compatible with various McCormick MC series tractors, including models MC80, MC90, MC95, MC100, MC105, MC110, MC115, MC120, MC130, and MC135. It also provides essential power transmission for select Case IH MXM series and New Holland TM series agricultural equipment.