Are the storm pro and rtr diff cases the same? What about the avenger? I keep breaking the upper "nipples" off the top of the rear diff case. Granted, I am beating the crap out of the car. I got aftermarket shock towers to solve the bending problem, but the diff cases are breaking every other time using it. So I am wondering if a stronger case is available. Thanks.

You need a Fioroni rear bulkhead brace. I have not broken a single rear bulkhead in 3 years of using it. I've got one on ebay as we speak. Oh, and yes, the Pro and RTR bulkehads for the Storm are the same, but the avenger is completely different.