1993 Bronco overdrive button doesn't work

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Fanman43

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My 93 bronco have an overdrive button on the shifter (automatic) and I have no clue how to turn it on or if it even has the original transmission that came with overdrive. How do I figure out? What do I do if the overdrive is broken? How will I know? Does the overdrive do anything special for the Bronco?

 

miesk5

96 Bronco 5.0
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yo Fanman,

E4OD, AOD & C6 Pan Identification & Driver Side pics;
Source: by Kenneth at http://www.technicalvideos.com/identify_my_transmission.phtml
 

E4OD Transmission Control Switch (TCS) and Lamp Operation (OD ON/OFF Switch and LED)

The transmission control switch is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module (PCM) (12A650). The powertrain control module then energizes the transmission control indicator lamp and the coast clutch solenoid, applying the coast clutch to provide engine braking and cancels fourth gear operation. The TCIL indicates overdrive cancel mode activated (lamp on), electronic pressure control circuit shorted or monitored sensor failure (lamp flashing).

With OD on (lamp off) the trans will shift into 4th gear (OD) at speed.

With OD off (Lamp ON), trans will not shift from 3rd to 4th (OD)

Transmission Control Indicator Light & Switch (Overdrive ON-OFF) Overview in 92-96;

A transmission control switch and an indicator labeled OVERDRIVE is located on the end of the gearshaft lever. Press this switch and the word OFF will illuminate on the shift lever ****. With the word OFF illuminated, the transmission will operate in gears one through three. Operating in overdrive OFF gives more engine braking than overdrive and is useful for descending hills. To return the transmission to the normal overdrive operation, press the transmission control switch again. The switch may be used to select overdrive or overdrive OFF at any time the vehicle is being driven. If the transmission control indicator light is flashing on and off repeatedly, the transmission system is malfunctioning. The transmission will operate in a failure management mode with harsh engagements, firm shift feel, and abnormal shift schedule.

 Transmission Control Indicator Light & Switch (Overdrive) Replacement; It is easy to replace & under $12.00 from local Ford dealer or a FSB Sponsor; Jeff's; be ready to catch the switch/LED assy when prying it off; it is spring loaded..not much force.
Source: by miesk5

Transmission Control Indicator Light (TCIL) Troubleshooting in 92-96; "... Several different complaints concerning the overdrive cancel indicator may occur due to a faulty O/D cancel LED. At times the light may simply fail to light, flicker erratically, or glow very dim. Tapping the shift **** lightly may affect the operation of the LED, causing it to work temporarily. These complaints are usually due to a faulty O/D indicator LED. To replace the LED carefully pry the cap off the end of the shifter and pull the LED/switch out. Slide the new switch into position and snap the cap back on. Note: Don’t confuse the above conditions with a steady flashing pattern of the O/D cancel light. A steady rhythmic flashing pattern indicates a malfunction has been detected by the computer.; Part #F58Z-7G550-A..."

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Source: by ATC-Distribution Group Inc. atcdg.com via http://web.archive.org/web/20020113193545/http://www.atcdg.com/TechBulletins/bull_135.htm

 
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