the viscolok has clutches and so chattering noises can occur just like as conventional clutch type lsd units. but if they do, you have too much preload and/or the wrong oil inside.
my various clutch type lsd units don't chatter!
a little scratching in tight, slow corners is normal for viscolok and clutch type and is a sign for a vital unit!
torsen units do not make any noise...
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