Yes, that probably was an overspeed. But from the sounds of it, must not have been bad enough to do any damage. Redline can be hit or even pushed when under load but freereving past red isn't good.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k