First things first, the BB is not necessarily the ideal tool for gravel drive maintenance, you can read a lot here on grading scrapers/land planes, or the landscape rake for maintenance. However the BB can be very useful, here's my best advice when it's what you have available (as is my current situation).
Scarifiers/ripper teeth down all the way, tilt the box all the way back with the top link so it rides on the rear blade (assuming you have one) and collects little material when you float the 3ph. Float the 3ph unless it pulls too much gravel with you and use the scarifiers to stir up everything as pine said. With a 54" blade a few passes may be required. You have to get to the bottom of pot holes with the scarifiers. Next, if you need to crown, do your best by tilting the box to the side with the adjustable lift link. Since a BB has no angle this can tend to bring along more material than you intend, so you may have to dump in every once in a while and distribute later. And rear blade or rake would be better than the BB here, but it can be done. Level and tilt the BB forward as necessary to do any major rework of the drive (scarifiers up at this point). Then tilt BB so you can ride on rear blade but collect high spots with front blade, or slightly more aggressive to collect material with front blade for filling lows (should be able to float 3ph hitch here as well). Finally, tilt back again on rear blade, float 3ph, and just drag to knock down any small windrows. Guessing your tractor is smallish like mine, use your heaviest vehicle to pack it down by driving back and forth, covering as much as you can.
Key to all of this is being able to float the BB. You will never achieve a smooth drive without very very careful attention to the 3ph controls with a BB unless you can float it. The "major repair" section is the only place where this is not true.