Question about 2006 Ford F-150

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Overdrive light flashing on 2001 F350 7.3 diesel truck

On our 2001 F350, only when towing our boat or 5th wheel, the overdrive light flashes and the truck has to be babied or warmed up for a while before it will go onto gear. What do you think is the problem?

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Taking a guess at it, I would have to say that the transmission fluid is thermally broke down from the heat, and stress from towing. Try to change transmission fluid and filter. If this does not fix it the transmission itself may be damaged from the excessive strain, and heat. (heat is number one cause for transmission failure. After this problem is fixed, next time NEVER tow in Overdrive. This over works the transmission, and creates the excessive heat. If you tow a lot than consider adding an after market transmission cooler. Which is only approximately 100 and up, but will save thousands in the long run:)

Posted on Jul 11, 2010

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I may be wrong,but look in your truck manual to make sure,under towing,I think when hauling,you are supposed to only use drive,,not over drive,with the selector.

Posted on Jul 11, 2010

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The 2wd - Auto - Lock switch can be switched at any time, as it operates an electromagnetic clutch - 2wd is rear wheels driving only - Auto - is to automatically engage 4wd when wheel slippage is detected (this also happens when turning at intersections, due to the inside wheels having a shorter path to the outside wheels, and can give a binding effect on sealed roads (I don't drive with it in auto on sealed roads) auto is excellent if you get, or expect wheel spin from an intersection when wet, just flick it on before or when you have wheel spin, also on gravel roads, having it on auto will greatly reduce the sliding of the back end, and make the car noticeably more stable.
Lock - this locks the differential, which further reduces wheel spin, when in mud / snow, but this will also make the car not want to turn corners, due to it resisting the different distances traveled by the inside and outside wheels.
A/T switch - this actually has 3 positions, and changes the shifting points of the automatic transmission - the middle is normal - Hold is to hold the gear longer, to improve fuel economy, and not change down (kick down) as quickly - Power has the opposite effect, it makes the transmission change down sooner under acceleration.
Also the O/D (overdrive) button on the side of the Tee shift lever, is to engage / disengage overdrive (5th gear) - never do heavy towing in overdrive, this will cook the transmission and overheat the engine (due to the radiator being used as a heat exchanger for the transmission fluid.
Another little quirk - if the transmission light starts flashing every 40 to 50 km, this can indicate that the wheels are different diameters (a flat tyre, or tyres have been swapped around and the spare is more or less worn than the other tyres), the computer will pickup that the wheels are turning at different speeds.
When cold, it is normal for the transmission to stay in 3rd (2-3 minutes of driving), until it has warmed up, and then stay in 4th for a few more km's (5-6 minutes), before it has warmed up enough to change into 5th (overdrive).

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