my transmission wont change gears on 2003 Ford Taurus

My car wont change from the fist gear, ive had the transmission flushed, and have replaced everything under the hood. can you please tell me why the trasmission is doing this.

by in Newport News, VA on June 19, 2012
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2 answers
ANSWER by , February 04, 2016
I had that problem, plus door locks stop working. I followed wires from door to under dash pulled plug trans worked great but no driver side door locks.
ANSWER by , June 20, 2012
I had the same issue a few months ago with my 2002.Not a thing that can be remedied with the trans in the car,and with the labor factor so high with removing it,I simply paid the big bucks,as in 3500,to have my local Ford dealer install a remanufactured unit.Just repairing the problem would have been over 2k,so that didn't make sense on a high mileage car.I like the car,it is well maintained,suits my purpose perfectly,so I put the money into it.Time will tell if it was a good investment. My understanding is that there is a piston inside that is prone to breaking,causing this problem.