Question about 2008 Ford F 150 2WD

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Transmission fault,7800 miles

Used overdrive off while going down mountain,clutches burned in transmission. Hand book says to use this way when on grade.

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Overdrive should be off going up and down a grade. This enables you to use the engine as part of the braking on the downgrade. On the upgrade you need the extra torque with a lower gear ratio to pull the grade. Overdrive off should not have affected the clutches in your tranny. There was obviously another problem causing this if it occurred.

Posted on Jul 12, 2009

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WELL ITS RECOMMENDED TO ALWAYS REMOVE FROM OVERDRIVE WHEN TOWING TO PREVENT TRANS DAMAGE. POSSIBLY HAD A PROBLEM ALREADY AND THIS WAS THE FINAL STRAW,SORRY DUDE. USUALLY THERE 4R70 TRANSMISSIONS ARE GOOD TRANSMISSIONS. POSSIBLY A BAD SOLENOID OR ISSUE IN VALVE BODY,DON'T CONDEMN INTERNALS YET UNTIL HAVE A TRANS TECH INSPECTS IT. THEY HAVE A FEW UPDATED FOR THESE TRANSMISSIONS ALSO

Posted on Jul 12, 2009

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1 Answer

How to fix dodge tran frm not going into overdrive


Dodge Truck? Or Dodge Car?
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1997 Mercury Mountaineer Overdrive flashing


When the OD light flashes it means the transmission has developed a fault. As to what the fault may be is yet to be seen without the system being scanned. In many cases the light indicates the transmission is slipping, you may not feel it slipping, but the computer (called the PCM) senses it through the internal speed sensors that measure main shaft input speed and shaft output speed in RPM. Other problems like shift solenoids can cause this as well. Another factor can be the transmission fluid is worn out, it should be replaced along with a new filter every 60,000 miles minimum.

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you can source a used transmission from a wrecker
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1760b438-134f-43bc-bedb-8594913fef03.jpg

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Mercury Mountaineer transmission is allowing 1st 3 gears but won't shift to 4th or 5th(Overdrive). What could be problem. I service the ****** regularly. Thanks


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If you have a manual transmission model, check the wiring to the overdrive solenoid (M46,M47 transmission with type M overdrive) and check all fuses. This solenoid simply opens a check valve that allows the overdrive to function (DO NOT reverse the vehicle with the overdrive engaged or damage will result to the unit itself).
Automatic transmission models also have an overdrive override solenoid, bottom left side. If it is stuck in the override mode, check for shorted wiring to the solenoid. Also check the switch which can bind closed. If you can put a voltmeter on the wiring to the solenoid itself, check for voltage; if you have voltage and the switch is known good, the wiring is faulty. No voltage means the solenoid plunger is stuck down. Remove the solenoid and repair or replace it. In most cases replacement of a well-used item is better than repair.
All models: Always verify the condition of the wiring and connectors before condemning the unit. In most cases a voltmeter will rule out what the solenoid isn't doing. If you have voltage at the terminals on manual transmission models but no overdrive function, the solenoid has either seized or the coil has burned out. On automatic transmission models voltage at the terminals means the opposite: the solenoid will override overdrive and keep it in the third gear. No voltage for manual means no overdrive; no voltage on the terminals for automatic models means overdrive engages normally; if this is the case, replace the solenoid.
If, after all this checks out, on automatic models, this means that the transmission valve body has plugged up with deposits. For manual models, it means roughly the same (the overdrive is essentially a one-gear automatic transmission) and it also indicates that something is amiss with the hydraulic circuits, in both cases. Low line pressure can also cause this to happen in both types which means either the fluid is bad, the valve body is dirty, the screen is clogged or the main oil pump in the transmission (automatic models) is leaking. Always perform a thorough check before condemning either transmission type - they are conventional in design and very sturdy.
On AW-7x transmissions, no brake bands are used, therefore only clutch packs are employed. On the M46 and M47 manual models, the overdrive is a bolt on unit (type J or type M, depending on year). On the ZF series of automatic transmissions, the overdrive is integral to the transmission, being a true fourth gear. All models use a solenoid to control the upper gear range.
Note also that if you have the manual transmission, it may prove risky to rebuild it if you can beat the synchro by a quick change. Rebuilds offer up different wear surfaces to the case and can make a noisy transmission noisier.
Automatic models utilize clutch packs front to back. Band brakes were eliminated entirely, and when these start to fail the most noticeable problem is sloppy, hard shifting even after a fluid and screen job. The clutch wear surfaces decrease in friction holding and become thin. This implies loose clutches and this implies poor shift quality.
Always change the fluid completely (including the oil cooler, note it is thermostatically controlled) and clean the magnets of all debris. Introduce new oil into the system and test again.

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1 Answer

How can i use the O/D


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1 Answer

2000 Gran Prix, 180,000 miles, not shifting into overdrive, no slipping of transmission about 3400 rpm at 65mph, can you drive it in the 3rd gear ?


You can till you burn up the transmission. The car not going to 4th could be your in the limp mode, there is something wrong with the engine or transmission and the ECM has put the car in limp mode. If there is a Auto Zone around your area, have the car scanned for DTC codes causing your ECM to run under limp mode. Keep an eye on your transmission fluid, if it started to burn ( dark Burgundy color ) service the transmission and hope you did not burn too much of your clutch in your clutch pack. Keep me posted, and good luck be glad to help.

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1 Answer

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1 Answer

1997 Accent trans. trouble after torque convertor replacement.


okay. there could be a couple of problems with your transmission.
1). it's quite possible that the clutch discs inside of your transmission have finally burned out. Hyundai has been known for making faulty transmissions for the accent for the first generation models.
2). if the car doesn't go in first gear, try driving it in normal mode and not economy. the accent purposely pulls in second gear in economy mode, when warmed up, in order to get into the high 30 mpgs.
3). faulty shift control solenoid. These have also been known to be defective with the first generation accent (1995-1999).
4). Your transmission fluid leaked out, prior to the mechanic fixing it, and the high heat building up in the transmission as well as the low amount of fluid in the transmission helped to burn it out.
for options 1 and 4, you wont know the actual problem unless you pull the transmission out and examine all of the clutch discs.
hope this helps...
~Proud owner of a 1997 Accent GL

Feb 17, 2009 | 1997 Hyundai Accent

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