when i took mine on a hill sideways it let the one tire in the air to start slipping for a little while and then it would klunck and shudder when it engaged the locker and then both tires began turning at the same speed and i drove off the hill and when i drift i can feel it when it locks up because i can hear it klunck into being locked my nieghbor who is a certifed GM mechinic says that is how it is suppose to be so i hope that helps a little...
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