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You don't need a real LSD to make a springblock work. Phantomgrip.com will make a spring block for 500 for anyone and they are designed to turn open differential into an LSD. They have 3 grades of springs. Their heaviest lock up to 75% in light japanese cars like 240sx's(2600lbs) and as low has 40% in big heavy cars like a sl500(4000lbs).
All it does is push the the spider gears apart to prevent the open diff action.
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