Now I know this is a major longshot. But has any member with access to lots of new limited slip differentials ever did a measured comparison with other applications to see if there is a off the shelf LSD that is close enough that a machine shop could machine another carrier to fit in a W116 or a W123 housing.........I guess I don't have enough important stuff to be doing right now to even dream that one up so humor me. This is an interesting "what it"....since there are no known off the shelf direct fit units.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche