A nice used main drive gear for Ford vehicles with the light duty 3 speed trans. It is used in Mustang 6 cylinder  64 and 65. Falcon 1963 to 1965 with 144 6 cyl. engine and Comet 1960 to 1962 with 6 cylinder engine. These old units have been switches around over the years so check parts carefully.  The overall length is 7 & 13/16 inches.   p-8-21-24-14.     8-21-24.  Thank you for looking it over.