I don't know much about that, but I would not drive it. Valve operation is dependent on the fluid, and I would guess that the least that would happen would be unpredictable operation.
If you have such a wrench, I would go under the car and drain the excess...Wouldn't take the plug all the way out...just enough to let some trickle down the case and close it immediately. Then top off if you you drained too much.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car