First thing to do is pull the flywheel dust cover and see if the flexplate broke. They will do that at the crank. I don't think you have the heavy flywheel. Since it just went "Bang" the tranny itself usually just don't quit unless a shaft broke. You sure it's not just a universal joint?
One way to check the flexplate is to jack up rear wheel, start it up, put in gear look and see if the TC is turning like it should.