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Originally Posted by boneheaddoctor
My W116 is supposed to have a 3.07 diff per its stamping...yet it turns far more rpms at 80 mph than my W123 that also has a 3.07 diff....about 800 rpms more. Why nobody can explain?
But my Heavier higher reving W116 gets 25 MPG very regularly...where my lighter lower reving W123 gets 20-22 mpg driving the very same route under identical circumstances........
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Does the converter stall any higher? That could account for the higher RPM as it doesn't lockup.
Do all 722 trans have a 1:1 4th gear? I believe that 116 has a four bolt version so maybe the gearing is a tad different? Such as a 1.41:1 final gear in the trans?
