The problem is you have too solid of a support (rear trans mount) and have enough flex in your chassis to break the tail housing. Maybe it was barelyholding up, and the engine failurepushed it over the limits. I run a mount that "floats" between rubber bisquits from bayonet end shocks. That gives it support, but i am carefull there is still a bit of give incase of severe stress. Running that deal since 1997, maybe i should check to see if i need new biscuits. 8.70s, no problems ever.