Yes, eLSD is clearly listed among the standard equipment on the Summits, but every sticker I have been able to find for delivered Summits shows it as deleted, (with a meager $400 credit). Also, the dealers I've spoken to say that Dealer Connect confirms that the option isn't offered, (despite remaining on the build site), with no known date for availability in the future. Also, as I understood it, eLSD is what enabled Quadra-Drive II, that is the continuous redistribution to wheels with traction, as opposed to the intermittent braking used for Quadra-Trac II. I don't see where Quadra-Drive II is offered anywhere now.