What could cause a crack in the bellhousing in a TH30 auto. Its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through. I did it at the track in the 1/8 mile. I have a 3500rpm stall converter and the car ran slow. It launched good and I got told last time I had a tranny leak. Climbed under the car and found the crack in the bellhousing. I have polyurethane engine mounts and tranny mount.