2k Rpms at 70mph - Ford Powerstroke Diesel Forum
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Old 11-01-2011, 09:36 PM
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2k Rpms at 70mph

I have a 373 rear and stock 31.5'' tires. Is this the sweet spot to be cruising on the highway? And normal for the trannie/setup Also, i got the opportunity to open it up at around 70mph, it didnt downshift, so i thought i was in the final gear, but once i hit around 87-90mph it shifted into the final gear which led me to believe that the trans is only in 4th gear at 70mph/2k rpms crusing?
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Old 11-02-2011, 08:10 AM
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I doubt it shifted at 87-90 unless you had it floored and that's when the TC finally locked up. 2k rpm is pushing it for cruising, you'll see better mileage in the 1800-1900 range. Under very light throttle it should be in OD with the TC locked by about 50 mph.
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Old 11-02-2011, 08:17 AM
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ya if you layed into it your TC probably unlocked and then locked back around 90.
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