1994 ford explorer

For car not changing gears it can be shifter assembly issue, or it can also be transmission issue. Get the shifter assembly inspected with ignition OFF.

For more troubleshooting, I suggest you to get the Following help link checked, its complete step by step procedure to inspect gear shift issues: -----

GEAR SHIFT ISSUES

http://alltypesofpartsreplacing.blogspot.com/2012/11/gear-shift-issues.html

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TRANSMISSION GEARS SLIPPING AND FLUID LEAKING ISSUES

Transmission gear assembly and transmission needs inspection. Also check the transmission fluid level. Also is the fluid getting leaked or its low.

There are few very helpful links with solutions to troubleshoot this problem.

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I suggest you to refer these links.

Click the link below:-----

2000 Toyota Camry: Transmission slipping and Stuck up?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-camry-transmission-slipping.html

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Transmission Slips out of 2nd gear?

http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

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Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html

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2006 Ford Explorer: Engine Vibrates and gears slipping?

http://whatisbyme.blogspot.in/2012/06/2006ford-explorer-engine-vibrates-and.html

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Clutch slipping problem?

http://howtobyme.blogspot.in/2012/03/clutch-slipping-problem.html

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Dodge Anti slip System is not operating?

http://whatisbyme.blogspot.in/2012/07/dodge-anti-slip-system-is-not-operating.html

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OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

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Transmission fluid leaks near radiator on ford windstar?

http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

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Ford Windstar transmission fluid leaking?

http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

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These details will help.

Thanks.

2 things it could be. 1) the dipstick housing has come loos or 2) the front seal is faulty.

have one myself w/over 400.000 miles suggest you change transmission fluid and filter,just add lucas transmission treatment to your fluid change. never had problems w.mine. but firm beleiver in lucas oil and transmission and fuel treatments. just trying to see how far i can go w/mine. the lucas treatment added to your fluid and transmission fluid and filter change frees up stuck valves in the transmission. sounds alot like you may have a stuck valve body in the transmission to me.pull your transmission fluid dip stick,this is going to sound strange but go with me for a second please, does the fluid smell burnt? do'nt be scared to put it on your finger and sniff it. if it smells like burnt expletitive,then it needs replaced and filter too. just please add lucas transmission treatment to your fluid change,you will not regret it. the treatment [lucas] will cost an extra $11.00 onto the fluid change,trust me, you will not regret it!fluid changes are a must for ford explorers 4x4 don't know why,but they demand baby formula. lucas,i've found is that formula. thank you for choosing fixya.com we are here 24/7 for you 7days

This is in the owners manual pages 269 and 270. TRANSMISSION FLUID
Checking automatic transmission fluid (if equipped)
The automatic transmission does not have a transmission fluid dipstick.
Refer to your scheduled maintenance guide for scheduled intervals for fluid checks and changes. Your transmission does not consume fluid. However, the fluid level should be checked if the transmission is not working properly, i.e., if the transmission slips or shifts slowly or if you notice some sign of fluid leakage.
Transmission fluid should be checked and, if required, fluid
should be added by a qualified technician.
Do not use supplemental transmission fluid additives, treatments or cleaning agents. The use of these materials may affect transmission operation and result in damage to internal transmission components. Checking and adding manual transmission fluid (if equipped)
1. Make sure the vehicle is on a level surface or level hoist.
2. Clean the filler plug or dirt and debris.
3. Remove the filler plug and inspect the fluid level.
4. Fluid level should be at bottom of the opening.
5. Add enough fluid through the filler opening so that the fluid level is at the bottom of the opening.
6. Install and tighten the fill plug securely.
Use only fluid that meets Ford specifications. Refer to the Lubricant Specifications in this chapter.

If you have a vacuum modulator on the trans,it could have a bad diaphram and **** trans fluid into the engine.
Now I do not know what model or unit trans you have. No vacuum mod,then the dealer is correct.
You can look just above the trans oil pan, near the rear, for that part and easily change yourself. Get at auto parts store. It will be the thing with a 3/16 vacuum hose on it,going to a port or vacuum switch on intake manifold

have the fluid changed, the new fluid should cure this.

could be modulator

I agree with the shift solenoid being the problem.

I have a 1994 Ford 4x4 6 the trans has starting to act funny when cold won't go in drive for about 5 min, also takes a long time to change gears after gets warm. I'm changing fluid and filter to see if that will help.. Any help is much needed thank you
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the transmission is loseing internal fluid pressure, its time for a rebuilt transmission. The A4ld that your explorer has is prone to trouble in this area. A good rebuilt transmission may cost at least $1700 dollars.