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Hello Starck,
My truck is also driven every day. There are no issues whatsoever with Mark's 4WD portal diffs. The vehicle is fully road legal and engineered. Speed is also not a problem. I have read elsewhere that early Unimog diffs. ( and Maybe Volvo 303s as well) overheated on long runs. My portals get no hotter than any other part of the axle assembly. If you wish to learn more, go to www. marks 4wdadaptors.com.au In Europe, Outback Imports in France are agents. Oh, by the way, portal diffs kick arse!!! LOL.