Local Rear Wheel Drive DSM...What?

[CVD]

Simply disconnecting the front wheels will not help your 1/4 mile. If the intent is to reduce drivetrain loss, you picked the wrong set of wheels to disconnect from the drivetrain. And without doing a proper RWD setup, traction gains (assuming slicks) are nil. So unless you think its cool, there is simply no rational reason to do that to a functioning AWD car.