[Hocrest]

Pull the rubber plug on the bell housing that gives you access to the Torque Converter bolts. There are a couple of holes in the flexplate that you can use, just don't break the flexplate.

Or an easy and possibly dangerous way... Use a socket and a breaker bar with a long enough extension to hit the ground to the side of the car under the battery. Just barely crank the engine over DO NOT START THE CAR. The nut will be loose.