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I have a Ford F series Pickup equipped with the E4OD. At times my overdrive light flashes and the transmission shifts very hard, what could cause this?

April 26, 2017equipped Flashes Ford light OverDrive pickup SERIES times

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I have a Ford F series Pickup equipped with the E4OD. At times my overdrive light flashes and the transmission shifts very hard, what could cause this?

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The flashing OD light is an indication of a transmission related trouble code in the Powertrain Control Module (PCM). When it has a trouble code related to the transmission it usually commands full line pressure to try to protect the transmission from damage. Normally this is caused by a transmission slip code. Have your computer scanned to see what transmission codes are stored. If it is a torque converter slip code keep in mind it could be stored from converter clutch slippage, or slippage in another transmission clutch pack.