Question about 1992 Ford F350

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Can you run a1992 ford f 350 diesel can i run tranmission in overdrive when pulling a large trailer

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  • dstack51 Mar 13, 2011

    the diesel turns to many rpm when your going 65

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  • Ford Master
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NO.Turn the overdrive off on truck when pulling trailer.drive with the OD OFF when hauling - it protects your transmission -If you run that way,then your transmission gets damaged.
"Overdrive" is just that... here's how it works: it makes the wheels turn more than one rotation for every rotation of the transmission/ engine. So basically when you're in overdrive your wheels are spinning faster than your engine, which takes stress off the engine in normal freeway driving when the accelerated mass of your car can maintain your speed and your engine doesn't need to work as hard. But if you are towing more weight, going uphill, etc., it actually makes your engine work HARDER because it has to catch up to the wheels to push that load. It's like this: imagine (and these are just arbitrary numbers) for every 1 rotation of your engine, your wheels are spinning twice. In normal freeway driving, the mass of your car at speed helps to push itself and the engine really only needs that single rotation to every double rotation of the wheels to maintain speed. But if you add weight, you are asking your vehicle to pull up to twice its mass at half engine power. This will make your vehicle sluggish and tear up your transmission, because it's trying to convert the engine's power to wheel power at a lower rate. Your engine will bog down and have to work twice as hard to maintain the same rate of speed.

When you turn overdrive off, it sounds/ looks like your engine is working "harder" but it's really just working normally. Towing is hard on your vehicle anyway, but its NOT doing any favors by keeping it in overdrive, its actually damaging the transmission.

Overdrive on causes more shifting of gears. When you drive your truck normally (OD on) and accelerate or go uphill you will notice the vehicle shifting gears. When towing, the weight of the trailer will cause this to happen more often. The frequent gear shifting when pulling weight is not good for the transmission.

---------------------
OD is your highest transmission gear. It is called overdrive because the
gear ratios in the trasmission makes the output shaft of the
transmission turn turn faster that the engine. In most modern automatic
transmissions, OD is the 4th gear. 3rd gear is usually "direct drive",
meaning that the output shaft turns at the same rpm as the engine. In
lower gears (1st and 2nd) the gear ratio is such that the engine is
turning faster that the output shaft.
If you select OD off, you tell your transmission to forget about
shifting up to 4th. It will upshift up to 3rd only. Your engine will rev
faster for a given speed compared to OD (4th), your gas mileage will
suffer a bit, but you will have more power available since the engine
rpm is higher, wich is good when towing. Also the transmission is less
likely to hunt gears between 3rd and 4th wich could eventually damage it.
You transmission may or may not run cooler with OD off. That depends
largely if the torque conveter in the transmission locks or not in 3rd
gear.The reason you turn your OD off is that the OD is the biggest cog in the gear box there for it puts more strain on it when towing and is the easiest to damage over a long period of time---------
The owners manuals recomed turning OD off when towing.-----------------
This should help.Thanks.Helpmech.

Posted on Mar 13, 2011

  • raj somaiya Mar 13, 2011

    If the tire size is less then rpm will be more.If the tire size is big then rpm will ne less.
    65 mph is ~1900 rpm for with 3.73's.
    ----------------------
    With 4:88 at 65mph and those tires you would be at 2403rpm
    -------------------
    With 5:33 at 65mph, 2625rpm

    With 4:33 at 65mph, 2132rpm
    -----------------
    With 4:10 at 65mph, 2019rpm
    ---------
    This would be in OD.
    ------------
    If the speed rpm is too much get the differential gears checked.------------- This should help.Thanks.Helpmech.

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