When i am driving at a speed of 40mph the car sounds as if its racing and should be going at 140mph i have to pull aside put the car in park then back it drive for it to be back to normal

Check your idle control valve.

You have to put it in neutral with the engine running and vehicle stopped to disengage and engage the 4wd.

change out both the speed sensors for the transmission...when one goes bad the next will soon follow. A call to a parts store or ford center can get you the location of where they are located.

sounds like the transmission maybe

i think only the link given visit their and your problem will be solved http://toolsnyou.com/

this all prove that engine and transmission co-ordination seems to be poor.

1. check accelerator sensor.
2. " accelerator pedal--transmission ctrl liver.
3. " transmission oil level.
4. " proper grade of transmission oil.
5. " pressure ctrl walls

It sounds like transmission. When the transmission begins to be sluggish. You can push the gas and the rpm will rise, but the car will not go anywhere or gain speed. Check the transmission fluid level to make sure it is at the appropriate level. If it is low, fill to proper level. This should make it go into gear better.

Your car probably won't go into overdrive below 35 or 40mph.I have a 1993 and I only put it in third gear only when I want it to stay out of overdrive,I always put the shifter in 4Th or overdrive.If your trans jumps hard between overdrive and 3rd gear or is always searching for a gear to be in you should be concerned and have it serviced.18 gallon tank.

mcdevito75 here, Sounds like the idle speed motor, Ford is known for these idle speed motors going bad, in the later stages the car races like crazy. have your repair shop check this idle speed motor and change it.

Hi there, let me see if I can help.

There's not much info to go on here, but let me try.....

Ok, if it's "pulling or stopping" in a jerking motion. It sounds like it might be engine related, however, it can be transmission issues also. Lets talk about engine.

Are there any check engine lights? That may be a clue that it's engine related...such as an engine miss.
Try putting the car in park and rev the engine from idle. (note: don't go into the red zone on RPM.) Does if feel rough and jerky? this eliminates the transmission. If so look at cyl miss issues, timing belt "out of time," EGR stuck open....etc...


If the engine passess this test, test drive the vehicle for transmission problems. Find an open road that does not have much traffic. Test at 20, 30, 40, 50, and 60 mph. go to a cruise at speed indicated and then accelerate at light throttle and then heavy throttle then coast.

Do you feel it only when applying power? Nothing on deceleration?

if it does it on most of these speeds (particulary at higher speeds) look at inner C/V joint. You will need to take apart the joint and look at the race for ridges. The vibration can happen when the rollers fall into the worn spots and causes a "jerking" feeling when applying power. (look for leaking grease from inner joints. Damage usually happens when all the grease leaks out.

If it only happens at and around 40mph, it could be a torque converter clutch. Try a transmission flush.
(drain, refill, and run through all the gears P,R,N,D,2,1 BE CAREFUL HERE!!! Keep your foot on the brake. USE YOUR HEAD!!!!!!!!! Don't run vehicle on jack stands. Repeat 3 times. ONLY USE HONDA TRANS FLUID. Yes, it does make a difference! Will take about 12 qts to do a proper flush. See if the problem goes away.

It might need a transmission it it continues after the flush, or you have some other problem that isn't obvious to me with the given info. Hope this helps and happy hunting.

Chris