I thought I might add that in the Vlsd the V stands for viscous. Viscous diffs are basically a single open diff with some friction plates that heat up a fluid which then engages the other half but only if it gets hot enough. This system works well if used for an extended period of time or if warmed up before use (eg small burnout) but generally, when driving around normally it wont do anything if you try to drift straight up. So it is a cheap alternative to a proper lsd but its like anything you get what you pay for.
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