R4871 IH Farmall Tractor Gear Shift, Torque Amplifier Transmission Knob Gear Shift / Torque Amplifier / Transmission Black Rubber Knob Replaces 397978R2 and IHS794 Fits 1086 1256 1456 1466 1468 1486 1566 1568 1586 3388 3588 4386 4568 Also Fits 756 766 826 856 886 966 and 986 Tractors 2.75 Inches Overall Length, .50 Inches Center Opening