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Originally Posted by John Winter
How would the swap to a 2.88:1 in a 123 (1945 300d turbo) limit top speed to 70 mph if 2600 is 65mph?
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Old300D is correct.
We are discussing the swap in a 240D n/a.
I am guessing that the available horsepower at 70 mph in high gear (at 2800 rpm or so) will exactly match the horsepower required to push the vehicle through the air at that speed.
It might achieve 75 mph, but, it would take forever to get there.