Gear Ford 5640 8340 TS100 TS115 4WD 37 Teeth ** 403964 is 38 Teeth - 403965 is Coupling ** ** 4831 is large O-Ring for Shaft ** ** 4873 is small O-Ring for Shaft **Info:Ford 5640 8340 TS100 TS115 4WD 37 TeethQT4831 Large O-Ring for ShaftQT4873 Small O-Ring for ShaftQT403965 Gear Coupling QT403964 Gear 38 Teeth