Question about 2000 Ford Expedition

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Rpm overspeed When i speed up from 1000 rpm to 2000 rpm and over my truck makes it up to about 40 MPH, then i slightly step on the gas for more speed and my rpm shoots up and my speed doesn't go up. I have to stop and try again and it works just fine. its over excelling and i'm getting no speed to traction.

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Have the transmission checked out,

quote http://www.aa1car.com/library/2002/bf90222.htm

One of the most common complaints with automatics is fluid leaks. Fluid can leak out of the driveshaft seals, the input shaft seal, the transmission pan gasket, the torque converter or the ATF cooler and line connections. If the fluid level gets low, the transmission may be slow to engage when it is shifted into drive. Gear shifts may be sloppy or delayed, or the transmission may slip between shifts

Posted on Oct 23, 2008

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I have a 2000 chrysler 300m im having problem with fuel economy the rpm is to high i dont know if this are like that but when im hittin 55m the rpm is almost hittin 2000 rmp is there somthing that needs to...


That amounts to about 27 mph per 1000 rpm which I think is quite high gearing.

For reasons of fuel economy vehicle manufacturers tend to choose a ratio for top gear that allows the engine to run at the speed of peak efficiency when the car is cruising at the speed it will be doing for much of its life.
Here in the UK we have a national maximum speed limit of 70 mph and most cars I have driven have an engine rpm of between 2500 and 3000 at that speed, which is the rpm lots of engines produce the peak torque output or are most efficient which amounts to the same thing.

Lots of small cars when I started driving were geared for less than 15 mph per 1000 rpm.

Vehicle handbooks often give mph per 1000 rpm or the dealer should be able to tell you. I suppose it is possible your car is suffering excess converter slip if it is an auto and that is the data that will indicate it as a likelihood.
Vehicle manufacturers tend to offer a wide variety of options and equipment alternatives and one of these is usually various final drive ratios. A manual gearbox usually has a lower ratio than an auto and a car meant for hauling large or heavy loads or a car intended for export to mountainous countries or regions will have the lowest ratio fitted. Rarely a car will be released with the wrong equipment for the region, but it has happened.
Different wheel/tyre combinations also can require different ratios and of course the vehicle speedometer is generally calibrated for a single ratio and wheel/tyre combination and would be inaccurate if the specification was altered.

Lots of things to think about and lots of research to do, I guess, but I suggest you first carry out a controlled fuel consumption test and compare it with the specifications. If the consumption proves to be excessive it would be wise to have the engine sensors checked/replaced first because a high gear ratio isn't always more economical.

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