Question about 1990 Ford F250

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Tranny is slipping.Is it the vacuum modulator? 91 ford explorer

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Vacumm modulator usually causes not to go into gear easy.. if you are going into gear then give gas and it slipps out of gear and fluid is good sounds like bands.. tranny time....if hard to go into all gears possible vac mod... if just one gear problem then that gear clutch band gone

Posted on Sep 04, 2009

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Tranny shifts into 2 fine, slips then slams into 3 no OD and won't downshift.


You don't say what car it is but it sounds like vacuum modulator and check your fluid. Modulator is on the outside of the trany drivers side. Check for a broken vacuum leak at tranny an at engine manifold vacuum supply for tranny.

Hope this helps Mike

Dec 16, 2015 | Cars & Trucks

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Does the 99 explorer have a vacuum modulator on the tranny and where would I find the vac hoses off the tranny.


There is no vacuum modulator on your vehicle ! It's controlled by the PCM ,all electronic shift control solenoids ! What DTC'S - diagnostic trouble codes do you have ? P0171 bank 1 lean code ? doesn't mean vac system leak ! could be a vacuum leak but also could be a O2 sensor problem or an intake manifold leak, brake vacuum booster diaphragm leak . What do you mean a slight code of gear three incorrect ratio ? P0733 ? P0733 Gear 3 Incorrect ratio Sorry Jon but you really should take this to a professional !

Jun 08, 2015 | 1999 Ford Explorer

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I have a 1993 ford explorer 2wd. It has about 275,000 miles on it. For some reason my transmission fluid is leaking into the engine oil. When I noticed that my transmission was slipping, I put a qrt. of...


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

Sep 19, 2010 | 1993 Ford Explorer Limited

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Transmision overdrive light started blinking check engine light went on tranny is slipping alittle between 2nd and 3rd gear. its got 80,000 miles and I had the tranny rebuilt at 51,000.


Many of the controls for transmissions are done electrically. If you have a "check engine" light showing, the problem is recorded in your Explorers' computer.

Both Autozone and Oreillys will scan your vehicle for free. This will show you what parts are causing the problem. Since everything is linked together there may be another part outside the transmission causing the shft problem.

It is also a good practice to check your transmission fluid with the motor warm and running. Low fluid can cause some shift problems. You would have to know what good fluid smells like to tell if your fluid is burnt. Smelling the fluid is an old fashion method to detect the health of the transmission.

You really do not have enough miles to have repeat problems with your vehicle. Once you get the codes read you will know what to do.

Jun 13, 2010 | 2002 Ford Explorer

1 Answer

MY TRANNY WENT OUT LAST NIGHT. I WAS REVVING IT TO


yes your tranny is shot if you have it in gear it should move. sorry :(

Nov 12, 2009 | 1993 Ford Explorer Limited

1 Answer

My 1997 ford explorer overheated and the transmission slipped


Tranny fluid may have been contaminated with coolant since tranny cooler lines go to radiator or condensor.
I would fix your leak on radiator, then completely drain tranny fluid and filter and replace.

Aug 06, 2009 | 1997 Ford Explorer AWD

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