Truck shifts up and down by its self it is a 2000 mazda
The OD light flashing indicates a code has been stored in the trans control module. If the speedo stopped working that could be the whole problem, the most common thing for the speedo quitting is the sensor on the top of the rear end housing, that causes 99% of the speedo failure. If that sensor isn't working the ABS light would be on too (if equiped) I would try that first or get a code pulled out of the computer and I could give you a more complete answer. -Jared
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