Here is the response I received from GS Racing.
Hello Rodney, This is unusual it seems that you may be binding up the axle and causing the universal to break under load. I would advise you to check your front suspension/ driveline components to make sure everything is working smoothly, also its not a bad idea to apply a lightfilm of heavy grease or graphite spray onto the universal.
Run the car a bit not to forcefully then check your driveline components to see whereexactly the pressure is being applied to the universal, then you might be able to catch the problem.
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> GS Racing Tech Support.
I believe that it has something to do with the steering throw. The knuckles are allow the wheels to turn more than the universals go therefore breaking them off. Just a hunch though.