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Old 03-08-2010, 12:02 PM
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offrdmania offrdmania is offline
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How many RPM's at 75mph?

My truck runs at 2300rpm at freeway speeds. Is this right?
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Old 03-08-2010, 12:39 PM
donbrown donbrown is offline
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Better than mine . Do you have 4.10 gear ratios? I think you might have 3.73 cause mine is over 2600 RPM at 75MPH 60MPH is around 2000 RPM
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Old 03-08-2010, 12:48 PM
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Ya i got 4.10 as well and i turn around 2500 at about 75 so you must be turning 3.73 gears.
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Old 03-08-2010, 12:51 PM
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Yes, mine has 4.10's. Im wondering if yours isnt shifting into OD?
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Old 03-08-2010, 12:58 PM
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Yes, mine has 4.10's. Im wondering if yours isnt shifting into OD?

Mine is an 5 speed manual.
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Old 03-08-2010, 01:05 PM
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At 85 on the way back from phoenix I was doin 2500 rpm roughly at 85mpg...
3.73's
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Old 03-08-2010, 01:55 PM
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Yes, mine has 4.10's. Im wondering if yours isnt shifting into OD?
mine definitely shifts into OD.
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Old 03-08-2010, 02:58 PM
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2250 RPM @ 70MPH is about normal with 4:10's and OEM size tires.
The speed-o is programmable for different size tires.
http://www.ford-trucks.com/forums/82...orrection.html
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Old 03-08-2010, 03:46 PM
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'95 4x4 5-speeds (one ECLB one RCLB), stock 235/85R16s, 3.55s, both do exactly 2000 RPM at 70 MPH. Equates to aprx. 2140 RPM at 75 MPH.

Same tires, same tranny should do aprx. 2250 with 3.73, and 2475 with 4.10.
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Old 03-08-2010, 10:48 PM
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Quote:
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Yes, mine has 4.10's. Im wondering if yours isnt shifting into OD?
can you hit 75 mph without od? mine sure wont. 55 and shes redlined
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Old 03-09-2010, 12:28 AM
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'95 4x4 5-speeds (one ECLB one RCLB), stock 235/85R16s, 3.55s, both do exactly 2000 RPM at 70 MPH. Equates to aprx. 2140 RPM at 75 MPH.

Same tires, same tranny should do aprx. 2250 with 3.73, and 2475 with 4.10.

What kind of fuel mileage do you get with 3.55's?
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Old 03-09-2010, 12:59 AM
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What kind of fuel mileage do you get with 3.55's?
17-18 in town, aprx. 20-22 on the highway. Best we ever got was 24. All stock; haven't even done the 6637 mod.
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Old 03-09-2010, 10:32 AM
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I have done some calculations on my mileage and the results are not so great! looks like I am getting just over 7mpg!!! What the heck. Dualls 4x4 make a huge differance or what? not sure on my rpms at 75mph cause we don't have a very straight rode around here. Lots of steep hills though.
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Old 03-09-2010, 12:14 PM
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I have a 97 crew 4x4 F250 and get 14 MPG in the city (35MPH) and 18 MPG on the HWY(70MPH) . That is at sea level with a pint of 2 cycle in the tank and a little DieselKleen.

Up in the mountains 3000-8000 feet on hilly roads going 40 MPH consumption goes to 10-12 MPG.
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Old 03-09-2010, 12:18 PM
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these trucks didnt come with 3:73s? only the superdutys, we have 4:10s or 3:55. and im screamin at 75 wiht 4:10s but my last truck has 3:55s and loved it on the highway. ***70mph***edit** was like 2100 i think.
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Old 03-09-2010, 12:18 PM
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