Question about 1997 Ford F350 Crew Cab

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Bad milage not able to get more than 9 miles to gallon truck has 460 cu. in. engine with auto trans and 410 rear gear only turns 2500 rpm at 70 mph

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  • yadayada
    yadayada May 11, 2010

    I am a retired Ford tech, I do know what mileage is average for a 2 wheel drive, it is about 8 MPG city and 13 MPG highway.

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Probly change out the rear-end to a higher gear-ratio, like 3.73 or 3.54 , depending on how much you drive interstate!?

Posted on Mar 12, 2015

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That sounds about right to me, and if you run that fuel with ethanol in it that does not help either

Posted on Sep 27, 2008

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1 Answer

2002 Pontiac Montana trans problem


no I don't think so , it is only the torque converter clutch engaging and disengaging due to engine load. if you want to test this. go on steady speed over 50 mph no gas pedal movement. touch lightly the brake pedal but not braking and release . during this see the rpm drop down and raise

hope it helps

Mar 24, 2014 | 2002 Pontiac Montana

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2006 Kia Spectra transmission will not have overdrive once it jerked. Usually RPM is at 2500 when driving up to 70 mph; but after it jerked, RPM will stay over 3000 when driving over 50mph, also it will...


you might have to have your transmission downloaded.you have to go to a kia dealer\'put it on a machine.if the code is out it will make your trans mission jerk.cost me $400 dollars.in my 2006 kia spectra ex

Nov 02, 2013 | 2006 Kia Spectra

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I have 58 chevy apache and have a turbo 400 transmission. It does 60 mph at 3000 rpm's. I would like to change the entire rear end so that it goes 60 mph at approx 2200 rpm. I now have a 350 engine in...


I don't think you can get a rear end that high sped, the best I've ever seen is a 3.2 something . I had that with a 305 and my engine revved higher than 2200 with that. I think you would be better off with a 700R4 transmission from the early-mid 80's. It should bolt on and the overdrive works off an electric/vaccuum switch mounted on the firewall. Hope this helps.

Dec 12, 2010 | 1983 Chevrolet C1500

1 Answer

Hi. I have an '82 F-150 with a 351 c.i. engine, the extended cab version with the full-length bed, 4WD, with only 20,000 miles on it. When I'm driving about 70 mph, the tachometer reads 3000 rpm, which...


Hi

It does look like you have a 3 speed C6, if the PRND21 description is correct. If you do have overdrive, the "D" will be printed in a white oval.

Sounds like it is OK. My Mustang has a 351C with a C6 trans, and 3000 rpm is about right at 70mph.

The defining factor on the rpm will be the Differential gears, which in a truck, might very well be taller gears instead of highway gears, as the taller gears provide more power output at the axles than the highway gears do.

Example:
if you had 3.0 to 1 gears (Highway), that means that the driveshaft will turn 3 times for every complete revolution of the rear wheels(Axle)

If you had 4.0 to 1 gears, then the driveshaft would turn 4 times for every revolution if the axle. Lots of torque for pulling stumps, but on the highway. the engine will have to turn more rpm's to maintain 70 mph vs a 3 to 1.

with the 3 to 1, you will turn less rpm's on the highway, but will have less available low speed power (Torque) at the wheels.

Sounds like the truck is doing fine.

Jun 04, 2010 | 1982 Ford F 150

1 Answer

1998 Yukon high idle sound with bad gas mileage.


What you have is the torque converter clutch,cycling on and off.
When it is off.your rpm will go up and your milage will go down
First-check to see if your brake switch, on the back of the brake peddle, is loose or misadjusted. When you apply the brakes,the first thing to happen, is that you unlock the converter,so your trans is not connected directly to the motor,or you would stall. Then below 42 MPH,your trans is working off the converter, as a pressure multiplier ,based on rpm
Second- switch okey. You remove trans pan and change TCC Solenoid.

Let me know if if you need more guidance

May 08, 2010 | 1998 GMC Yukon

2 Answers

What ring and pinion ratio should I use for my 2006 f150 4x4 with35x12.50x20 it currently has the stock 373s i want it to get okay fuel economy and still be able to tow a 5000 pound trailer as of now it...


I would leave the gear ratio you have in there. If you go to a 4:11:1 ratio you are going to be turning higher rpms which means more air/fuel mixture being burnt. If you go lower say 3:55:1 you will loose your pulling power.

Mar 07, 2010 | 2006 Ford F-150

1 Answer

Accelerating Problem


if the hydraylic torque converter or trans is low on fluld then the bands and servos will not accuate the gears properly

Aug 24, 2009 | 2002 Oldsmobile Alero

3 Answers

4000 rpm at 70 miles per hour


You should have another gear "5th" at 70mph your tacho should read about 2500 rpm.
Make sure you don't need to depress something or push the gear stick against a spring to select 5th.
Is there a gear layout on top of the gearstick knob, do you have 5th gear on there?
The highest gear ratio is a little over 1 to 1 so at 70 mph you would expect 3500 rpm, but, it is a little over 1 to 1 so it will be closer to 2500rpm.

Aug 18, 2008 | 2005 Volkswagen Jetta

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