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Hi EVE , I would suggest you take it to a reputable ASE Certified repair shop ! Do you know what transmission you have there are three different ones for your vehicle along with three different engine possibility's ! It could be the switch or a solenoid in side the transmission or a wiring problem or even a control module problem !
OVERDRIVE OFF SWITCH
The overdrive OFF (control) switch is located in the shift lever arm.
The switch is a momentary contact device that signals the PCM to toggle current status of the overdrive function. At key-on, overdrive operation is allowed. Pressing the switch once causes the overdrive OFF mode to be entered and the overdrive OFF switch lamp to be illuminated. Pressing the switch a second time causes normal overdrive operation to be restored and the overdrive lamp to be turned off. The overdrive OFF mode defaults to ON after the ignition switch is cycled OFF and ON. The normal position for the control switch is the ON position. The switch must be in this position to energize the solenoid and allow a 3-4 upshift. The control switch indicator light illuminates only when the overdrive switch is turned to the OFF position, or when illuminated by the transmission control module.
OVERDRIVE ELECTRICAL CONTROLS
The overdrive off switch, valve body solenoid, case connectors and related wiring can all be tested with a 12 volt test lamp or a volt/ohmmeter. Check continuity of each component when diagnosis indicates this is necessary. Refer to Group 8W, Wiring Diagrams, for component locations and circuit information.
Switch and solenoid continuity should be checked whenever the transmission fails to shift into fourth gear range.
sounds like a transmission issue could need a transmission fluid flush then you should be fine the first indicator that your transmission is going bad is the first gear and reverse but since its overdrive probably just a tranny fluid issue hope that helps
the overdrive is the 4th gear. considering that it may not be an issue with your computer switching gears to fourth but an issue with the transmission itself. this light could be a signal instead of and engine warning light where the engine is fine but the transmission isnt.
That could be a switch problem or a bad solenoid in the transmission. I do not recommend you try replacing the solenoid your self unless you have a lot of special tools for removing the transmission and opening it up as well as putting it back together. Some checks to do before you condemn the transmission: 1. Check the fluid level to make sure it is between the two marks on the dip stick. 2. Check that the overdrive switch is actually working. This is located on the Shift arm in most cases but occasionally is located on the dash somewhere near teh shift arm. 3. If the indicator for Overdrive is the actual position you have the shift arm in, indicated by a circled "D" then it may just be a matter of adjusting the cable. You can actually change gears on this vehicle by turning the lower portion of the steering column if it has the center console shift. This all points to a minor adjustment problem.
What trans? AOD? This is 1992 F Series, all I have.
Shift Controls, Automatic Transmission
The transmission shift control linkage or cable transfers the transmission operating mode from the selector lever to the transmission. The indicated transmission position on the steering column is transferred to a shift lever on the bottom of the steering column. On vehicles equipped with cable-operated shift systems, the indicated position of the transmission selector lever is transferred to the transmission through the shift cane, then to the cable, and down to the transmission manual shift lever at the transmission. On vehicles equipped with shift rod assemblies, the rod transfers the indicated transmission selector level position through a bell crank assembly to a control rod. The control rod transfers the indicated position to the transmission assembly.
Automatic Transmission Manual Linkage Adjustments
With the engine stopped and the parking brake applied, place the transmission selector lever at the steering column in the D (DRIVE position) for C6 applications and in the (D) (OVERDRIVE position) for AOD and E4OD applications, and hold against the D or (D) stop by applying a three-pound force to the selector lever knob.
Loosen the shift rod adjusting nut at point A. Refer to the following illustrations.
Shift the manual lever at the transmission into the (D) (overdrive) position for E4OD, by moving the lever all the way rearward, then forward two detents.
With the selector lever and transmission manual lever in the(D) position, tighten the nut at point A to 17-24 Nm (12-18 ft-lb) torque. Use care to prevent motion between the stud and rod.
Remove the three-pound force from the steering column selector lever knob.
Operate the shift lever in all positions to make certain that the manual lever at the transmission is in full detent in all gear ranges. Re-adjust the linkage if required.
On F-Super Duty Chassis Cab and Motorhome and Commercial Chassis recheck for correct operation of the automatic transmission selector indicator (PRN(D)21). Refer to Section 11-04A, Steering Column, Shift Rod Within Tube.
CAUTION: Under no circumstances will it be permissible to adjust linkage in any position other than the(D) position for E4OD applications.
From inside the vehicle, place the column shift select lever in the DRIVE position (C6) of the OVERDRIVE (AOD and E4OD). Hang a three-pound weight on the selector lever.
Raise vehicle on a hoist.
Remove the shift cable from the transmission lever ball stud.
Pull down the lock tab on the shift cable body.
Position the transmission shift lever in the DRIVE position (C6) or the OVERDRIVE position (AOD and E4OD). This is three detents from the front-most lever position with the first position counting as one.
Connect the cable end fitting to the transmission lever ball stud.
Push up on the lock tab to lock the cable in the correctly adjusted position.
Lower vehicle down from hoist and remove the three-pound weight from the column shift select lever.
After making the adjustment, check for park engagement. Check the transmission control lever in all detent positions with the engine running to make sure correct detent/transmission actions. Readjust if necessary.
Things haven't changed much...look on top of the transmission in the engine compartment and look at the shifting linkage. Look for anything that could be interfering with the shifting. One linkage is the cable to the Shift Lever and Rod that goes down into the transmission. Remove the cable adjustment screw.
Move the shift lever rod towards the front of the Van into the Park Indent Position. Place the Driver's Position (Dash) Shift Lever into Park and then reconnect the Cable to the Shift Lever and tighten down the cable adjustment screw to 70 in-lbs.
Let me know if this helped, or if you have any additional information, questions of problems, Feel free to contact me at FixYa.com!
first of all, does it shift into overdrive, I would check and see first of all if you drive it and it does go to O.D. then press the button once, does it not go to O.D. you can do this while driving, when running about 45 press the button once, do you feel it downshift. if yes then your light is burnt out...if no run an OBDII check to see if there are nay codes for the transmission. if that checks out theN i would go for the switch being bad..