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help with rpms

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Old Jan 8, 2013 | 12:30 PM
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help with rpms

i just put a 6.9 in my f350, it originally had a gasser so i have no tach, it has a 4 speed with 3.55s about what kind of rpms at 60 mph and what kind of fuel mileage am i looking at?
 
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Old Jan 9, 2013 | 04:58 AM
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at 55 mph about 2300 rpm and at 60 mph prolly 2500 rpm. i get 14-18mpg
 
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Old Jan 9, 2013 | 05:35 AM
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If you are running stock 235/85/16's (calculated at 31" diameter) tires, with 3.55 axle gears, in 4th (1:1) your rpms will be:

35 mph = 1,374
40 mph = 1,540
45 mph = 1,732
50 mph = 1,925
55 mph = 2,117
60 mph = 2,310
65 mph = 2,502
70 mph = 2,694
75 mph = 2,887
80 mph = 3,079
 
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