Here be my picture. I got '66 289 with C4. This is on drivers side. On left side of pic. you will see where it goes into tranny. Pretty easy job. Takes some patience trying to get it out. A 3/8' or 7/16" wrench i think ya need. There are right hand & left hand driven gears. Make sure you get the right one, with the correct amount of teeth. Mine had 16 teeth and was Right hand.