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H3 Aluminun Differential
I think I remember Martin Walsh, Hummer General Manager, remarking (in a video?) about the concern about the aluminum front differential- my web search came up empty.
That is why Blue_Beauty will continue to be better_half's commuter vehicle with some design benefits for nasty weather and terrain and we will leave all the new trails for others.
As an aside, if we get a new iron differential (dream on) they best include beefier torsion bars and shocks.