Burnouts and the 904

In the past, I used a Mopar 4-speed manual transmission and always did simple burnouts using only second gear. My present build will use a Mopar 904 automatic (1972). One thing I DO NOT want is a manual valve body. I read somewhere that doing burnouts the wrong way or with a stock transmission that a tranny can be damaged while in low gear. How do I modify the transmission or my burnout technique to avoid damage? I never had a problem with the 4 speed in that regard and I am somewhat apprehensive not knowing the quirks of an automatic. (The motor will provide between 300 - 400 horsepower, either a 318 or 340) Thank you.