You can get LSD in 7 and 7 1/2 inch but the internals are not swappable
generaly speaking the 7 inch LSD is found in the 2.8 4x4 Sierra and is 3.6 ratio
the 3.9 ratio LSD is found in the 2.0L DOHC Sierra 4x4
the Cosworth 7 1/2 inch diffs are usually 3.64
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