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I HAVE A 99 FOR F-450 WITH THE 7.3 DIESEL AND A SIX SPEED MANUAL TRANSMISSION. I GUESS BECAUSE OF THE GEAR RATIO I DO 65 MPH AT ABOUT 3500 RPMS. I PLAN ON CHANGING THE GEARS SO I CAN LOWER THE RPMS. BUT WHAT I WANTED TO KNOW IS DOES THAT HARM THE ENGINE ANY. :burnit- F-450 HOTSHOT
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- Forum: 99+ 7.3L PowerStroke Engine & Drivetrain
