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Originally Posted by R Leo
Lilly is a box stock '84 300D (auto), 3.07:1 final drive ratio and Michelin X-One P195-R7014 tires.
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Thanks.
The calculated engine speed for that combination at 75 mph is 3132 rpm.
The actual engine speed, confirmed with GPS at 75 mph is 3350 rpm.
So the slip in the automatic is 218 rpm's in this specific case.
This is valuable data for the future and is useful to predict the rpm of the engine, equipped with an automatic, at a given road speed.