W116 1980 300SD 3.0L Transmission Question - Mercedes-Benz Forum
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post #1 of 3 (permalink) Old 03-05-2010, 08:45 PM Thread Starter
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W116 1980 300SD 3.0L Transmission Question

I have a 1980 300SD 3.0L T/D and an auto trans. At 55MPH I am at 2700-ish RPM. Is this a 4-speed or 5-speed trans. It doesn't seen to be abnormal, and shifts fine. Just wondering if this is normal and if there is any way to adjust it. If I travel the e-way it can go 70 mph, but if seems like the RPMs are too high.
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post #2 of 3 (permalink) Old 03-06-2010, 05:40 PM
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Vehicle: 1980 300SD, 1987 300SDL, 1973 280SEL, 1995 C280
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Seems about right. You'll be over 3k at 70 mph and the OM617 will cruise at that speed all day long. Tranny is 4 speed.
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post #3 of 3 (permalink) Old 03-18-2010, 08:07 PM
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If you notice there's a highlighted marking for 55mph as I am sure yours has an 85mph speedometer. It was designed for economy at.....you guessed it 55mph in an oil crisis economy. It can run at 70mph of course but it's really starting to push the limit of the motor which has a relatively narrow bandwidth of power. You may also want to borrow a GPS to check the speed accuracy.
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