Hello to all fellow stang owners and fanatics. I recently cracked my C4 trans on my 66. I managed to pick up a used but running C4 from a friend. The tranny like I stated had not been giving him no problems whatsoever. When I finished the install, I went to turn the car on and notice a high pitched grind coming from the trans. At first I thought it might ahve been the starter, but nothing seems to be wrong with it. The torque converter went in the three steps it needed too, and im stuck there. I dont know what it could be. If someone has an idea or has ran into this before let me know, Im desperate to get my baby back on the road. Thanks for the info beforehand.