1982 Chevy Truck starting operations

Engine Mechanical problem
1982 Chevy Truck V8 Two Wheel Drive Automatic

I am having trouble getting my starter/fly wheel to work. Lined up as much as possible they will not work together properly. Something seems to jar the starter so much that I have been through about four starters. It seems to be catching at one point on the flywheel. It torques the starter in such a way it has split the bolt holes and the housing around the bendix. Could you tell me what might be causing this to happen (i.E. The crank, torque converter, etc.)?