Spool up front would scare the crap out of me, I'd be constantly worried about my birf's, I have Downey/Auburn's front and rear currently. I have learned through the years that a limited slip front does not work as good when backed up by a rear locker, you can't stab the brakes to engage it without killing the motor. so what I'd do if I were to go full locked would be a spool in the rear and a Aussie in front or Detroit in front.