Gear Coupling Ford 7840 4WD ** 403963 is 37 Teeth Gear - 403964 is 38 Tee ** 4831 & 4873 are O-Rings for Shaft ** ** 43300 is Drop Box Shaft **Info:Ford New Holland 40 TS SeriesGear Coupling Ford 4WDQT4831 & QT4873 Are O-Rings For Shaft QT403963 Is 37 Teeth Gear QT403964 Is 38 Teeth