I would love to know what your mechanic did to the VLSD. Inside the VLSD, it's filled with silicone fluid. The VLSD acts like a torque converter with the fluid acting like a transfer medium. Once the fluid gets hot. It loose that ability.
My opinion is that once you drop the diff and open it up. You're better off installing a proper LSD. Because you're already there. I have an OS Giken 1.5 way set to 70 percent lock. Held in place with a SPL solid diff bushing and a Bell diff brace.
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