gear mesh would yes, but that has nothing to do with how the diff works though. The Viscous works by virtue of the fluid inside it, which is different from the normal rear end fluid, heating up. The viscous is a sealed unit
I did a post a few weeks back outlining the various diff options. Cusco and OS are both great choices. We run an OS in one of our Z's, and I've been running the Cusco in mine for about 5 years now. Biggest issue with the Cusco is you just can't get your hands on it right now without paying extra to air it in, or waiting a significant amount of time (few months). Demand has slowed down, so we're not bringing in the normal stocking orders we used to
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