2000 Ford Mustang GT Malfunction - Drive Train & Driveline

Question: If you can help me I would really really apreciate it. I have a week before I'm suppose to be in Iraq. But befor I go I want to take care of this problem because my mom is going to drive my car while I'm gone. I was on the highway doing abou 80-85mph and everything was fine and then my transmission dissengaged on me, and the every time I tried pressing on the pedal it just reved up the RPM's. I've been driving it for about two weeks since this has happened. The transmission shifts find from 1st to 2nd. but when I reach about 30mph, when it should shift to 3rd it won't. It will not shift pass 2nd at all. When I take the overdrive off it still won't shift pass 2nd but it will grive pass 30mph I can reach 75mph before taking the rpm into the red. If this helps any I want you to know that it is an automatic but I was down shifting it into 2 like it was a stick. If there's a computer box or something like that, that tells it when to shift that may have gon bad can you tell me please. I went to AMMCO and they charged me 75.00 to tell me my transmission was over heating, but I guess it would if your drving around with your rpms allways over 4500 to keep up in traffic. It was a waste of money and I still dont know whats wrong with it they want to charge 2500 to rebuild it. but my gears inside were working fine. the car just will not let it self shit in to 3rd then 4th. It may have something to do with the overdrive. I'm willing to work on this myself. I have replaced trans before but never rebuilded one. Thanks in advance Brian Fletcher

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Technican: Hello, You need someone to check your car's computer for transmission codes. Then road test with a scan tool connected to monitor the shift commands and the feedback/result. If the upshift is commanded, but does not take place, then the shift valve could be stuck or perhaps the shift solenoid is bad. I doubt you figure this out without a scanner. AMMCO sure let you down without telling you why they are thinking overhaul is the only fix. Did they check for codes? Did they drive the car with you in it? Did they use a scanner to monitor the transmission? That's what you need.

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