The STOCK VLSD and open diff have different output shafts. It appears that Kaaz makes 2 different sized differentials to fit either or. I think that's what it means. A 1.5 LSD for open diff shafts should perform the same as a 1.5 LSD for VLSD shafts. You just have to pick out the right one for your application so you can save yourself time and money.
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