I have tried lots of combination, locking just the rear, locking only the front, unlocking all, and found locking both front and rear the sweetest and work the best for both my TT01 and TT01D. I guess it depends on drifting style and everybody have different preferences, personally I love doing very long sweeper, and always drift at high speed, the extra traction and control I get from all wheel drive help a ton, especially understeer!