How hard is a burnout on a car, mechanically?

I did a 4 second "burnout" in my '95 Z28 today (stock) at low rpms. Without regard for tires, how hard is doing that on a car? I can see how 45 seconds to a minute could cause problems because you're at high rpm, with the engine under load, with little air moving through the radiator. But for a short one, how hard is it on the differential, drive shaft, , and engine? What about brakes? Seems like spinning the wheels for four seconds with the brakes depressed isn't much different than your every day stop at a red light... I don't see how it could be very hard on the brakes... And it seems like a 300hp engine would laugh at whatever resistance the rear brakes had to offer. I'm mostly worried about the effects even a short burnout could have on the and the differential (suddenly spinning quickly, then suddenly stopping).