Question about 1994 Ford Explorer Limited

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Transmission Problem Transmission is not shifting correctly. I replaced the 3-4 shift sylenoid and the torque converter lock up sylenoid. On the drivers side of the transmission are two, what appears to be band adjustments. Can you confirm or tell me what they might be? And can you tell me the adjustment specs sense I moved them both and made it run worse. Seems like these adjustments affect the engine running smoothness also. HELP. Thanks, Dave

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Band adjustment goes like this, Break the jamb nut loose and back it off a couple of turns then torque the center stud to 10 ft pounds then back it off 2 turns and tighten the jamb nut.

Posted on Oct 04, 2008

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Vibration in transmission

I do not know if this vehicle has a torque converter lockup or not, but sounds like it. Does the transmission stop shaking when you go over 65? Some vehicles have a torque converter lockup, which means when the vehicle is traveling at a certain speed in high gear the torque converter "locks" and there is no slippage to the transmission resulting in better fuel economy. if the torque converter doesn't "unlock" when you slow down to say 45 then the engine will "lug" causing vibration. If this is the case you are not hurting anything by driving, just shift to 3 when it shakes then upshift under lighter load, or take it to a shop that replaces transmission sensors.

Jul 22, 2014 | 2004 Toyota Highlander

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What does a shift solonoid do and also what does a torque converter do

A shift solenoid controls oil flow to the clutch packs in an automatic transmission. It uses DC power to turn them on The clutch packs control which gear you want The torque converter is basically a slippable clutch when you accelerate it engages and drives the gearbox

Oct 22, 2013 | Cars & Trucks

1 Answer

1998 Mercury Sable: I changed the transmission seal and now when it shifts the light starts blinking overdrive. Could it be that a clip or sensor is not hooked up because it shifted great before and the...

Which seal was replaced? The torque converter (or main seal). Or one of the axle seals? Or another seal somewhere else? Usually the O/D light flashes when you have a TCC solenoid or shift solenoid problem. Like... if there's no power going to the torque converter lock-up solenoid, It will not go into fourth gear because the tcc solenoid cannot lock up the torque converter properly. Depending on which seal you've replaced, it may just be a coincidence. Maybe the light would have done this regardless. Either that or maybe something is not connected tightly. Maybe one of the transmission connectors.
I had the same light flashing in mine when I disconnected the valve body wiring connector because my torque converter was locked up solid and that was the only way I could move the car into the garage.
I would take a good look at the transmission connectors and make sure that all the connectors are tight.
I hope this helps, good luck!

Aug 30, 2013 | 1998 Mercury Sable

1 Answer

Codes po740, po743 ? po753 all at once. Where should i begin for repairs?

You must do the diagnostics for each code.
Here are the possibilitesP0740 DODGE - Torque Converter Clutch Circuitxicon.jpg CodePossible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
P0743 DODGE - Torque Converter Clutch Solenoid Circuitxicon.jpg CodePossible causes- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

P0753 DODGEP0753 DODGE - 3-4 Shift Solenoid Relayxicon.jpg CodePossible causes- Faulty shift solenoid valve
- Shift solenoid valve harness or connectors
- Shift solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

Jul 03, 2012 | 1997 Dodge Ram 1500 Club Cab

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My bravada (2000) has a transmission problem. I took it to an expert and he said it doesnt have a second gear and it will cost 1200 to 1800 to fix. Is there any other way? Is there any recalls on this year...


May 19, 2011 | 2000 Oldsmobile Bravada

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1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...

P0740 JEEP - Torque Converter Clutch Circuit
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

Mar 27, 2011 | 1998 Jeep Cherokee 4WD

1 Answer

Shifting very slow

Hi and welcome to FixYa!

If the shifting is slow then the problem will surely be on the transmission fluid. If the transmission fluid is burnt the transmission tends to shift slower than expected. If the fluid is new and problem still persists, you may have a faulty torque converter. The torque converter controls the shifting of the car. Once the torque converter is replaced, a smooth drive and shifting will be noticeable.

Hope this helps and thank you for using FixYa! Have a good one!

Jan 26, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

I have a 1500, 5.7, 2 wheel drive with a 4 speed transmission with O/D . How many times should it shift including the O/D and what does the lock in torque converter have to do with it?

It should shift 4 times. 1-2, 2-3, 3-4 Then you will feel the torque converter clutch lock up which feels like a shift. The torque converter locks to increase gas mileage.

Dec 28, 2010 | 1993 GMC Sierra

3 Answers

The transmission shifts hard enough to chirp the tires when taking off from a start

It would help if you said it was manual or automatic.
Since it would be clutch and not transmission on a manual, then I must assume it is an automatic.
But even in an automatic, when you start out you are already in 1st gear, so it can not be anything to do with shifting.
Therefore I suspect you have a problem with the torque converter.
It could be locking up some how, either from a bad bearing or a lock up mechanism coming on too soon.
Sorry, but can't think of a way to test or fix it other than a tranny expert.
I believe tapping the brakes is supposed to unlock a locking torque converter, so you could try that. not hard enough to stop the vehicle, but just to see if it disengages.

Jul 20, 2010 | 1998 Chevrolet S-10 Pickup

1 Answer

Got error

Transmission related (Shift Solenoid E Electrical)

Shift Solenoid E is the solenoid in the transmission (automatic) that controls torque converter lock-up.

Either this solenoid or its wiring is either shorted or open.
explains diagnostics for this code for a Toyota Camry.

While your car does not have the same connectors and pin numbers, the principle is the same.

It is a pretty elaborate problem to diagnose and fix for a backyard mechanic, but in case you want to fix/learn about it:

Torque converters : (very good article)

Sorry, I'm not sure about the exact lock-up solenoid configuration in your particular vehicle...

Aug 30, 2008 | 2006 Mazda 3

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