???? what happened????

Ok I got my new blower motor installed. I am going to push the car out in the driveway to clean the garage. and It wont move. I check brakes nothing wrong everything clear. I jack up the rear and the back tires wont move take out the drive shaft and tires spin free as a bird. tranny is in Neutral. I look at the bottom of my tranny pan and right at the back there is a big dent. When I installed the motor my board fell of the jack and I didn't pay attention to it and jacked up the trany anyways (MORON) can or will this cause the trany to lock up. any help will be great full I don't have any money to fix it since my wife is Due this friday with my new baby girl and time is of the essence. Thanks a billion Eric