Well 100,000s of Humvees/H1s certainly hold up fine at those speeds without overheating. Axletec s use a similar geared hub high speed axle with excellent reliability and durability.I've seen those, but only in reference to KOH / racing.
How will they hold up running 80mph on the highway for hours on end?
TIBUS has done bolt on portals for G class for a while and I've heard a few of their early ones don't have enough oil / cooling and would destroy themselves on the highway. Mercedes OE portal axles (designed by LeTech) would have to meet Mercedes specs and warranty risk.
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