Before getting into a pissing contest, I want to say that some differentials will lock with a VERY fast downshift. However, in my experience, this has not been a problem or a reason for heel/toe. I realize I got caught up in arguing again, and I apologize, GTX. When racing, speed is key. Sometimes the fastest line requires the driver to do many things at once. This is when heel/toeing becomes necessary. I have broken traction with quick downshifts before, but I have never locked up a rear. Through some research, I have realized that some people do run into this problem, but it doesn't seem to be very common in racing at my level (low).
Jon
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