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First, congratulations on your 240D! No problem with high rpm. My '88 300SEL also runs at the same high rpm. Most 4 cylinder diesel pickups in the rest of the world also runs the higher rpm without problems.
As far as swapping the differential, I will leave that to the experts!
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2012 Mercedes E350
1988 Mercedes 300SEL
1996 Nissan Pickup
2003 BMW K1200GT
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