As you all know I have two Benzes a 1979 300SD.....and a 1983 300D.

I have almost a 1,000 RPM difference between the two cars on the road at 70 mph.

Both are the 4-speed automatics....both have differentials stamped with 3.07. Both run tires nearly the same diameter.......This baffles me. The 300SD cranks way more rpms on the road and it IS shifting through all 4 gears. with minimal slippage (as all automatics have some).

You can audibly hear the differences, its very noticible...so its not a tach inaccuracy thing.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche