I prefer locking both front and rear diff, sending power to all 4 wheels(now I have full time ALL WHEEL DRIVE instead) allow me to drift smoothly...MUCH better than locking the rear alone, it help me counter-steer and maintain a super long drift with authority! I jammed pack cotton/fiber(pull from old pillow) in both my diff, instead of using puddy or JB weld like someone else suggested, it's very effective with no messy stuff, and can be undone in minutes.