I have Kaiser locker in my Pajero TR4 year/model 2010, in the rear differential, and it is perfect...It makes some noises (crackling, this word makes sense for you?) but it is not common...only in some corners in uphill, for example, because it is an automatic locker that compensates the difference of speed of each wheel on curves, so, sometimes, when the crown wheel is not fully paired it makes the mentioned noise, which is nothing more than than the crown wheels aligning themselves when the gas is pressed.
Now, concerning to reduce gear or kaiser locker in front differential, sorry, I can't help you.
I will try to search a bit, ask one friend or another, trying to help you.
regards