2004 Chevy Silverado SS 427 6.0 Liter...how to remove the front drivetrain making...

[xXGUINN5o5oXx]

...it rearwheel drive not AWD? i have a 2004 Chevy Silverado SS custom with a 427 6.0 Liter engine...it happens to be an AWD truck and i need to know how to remove the front drivetrain making it rearwheel drive instead of AWD for a car show i want to enter it in so i can spin some tires lol but i wanna do it safely and correctly so i dont warp the axel or mess up the drivetrain or the differentials any help or website links will be much appreciated thnx