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I just bought a 98 Taurus and a couple days later it will not shift into what i'm guessing would be 4th. It runs up to 60 like normal and then will not shift. After doing a lot of searching I have found the tranny valve body is a common problem. I saw there was a write up in an older thread on the valve body, but it's missing the pictures. I just wanted to see if you guys think this is the problem or if it would be something else?
 

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4th gear is overdrive, make sure that overdrive is on, also tell us if the OD light flashes

btw I have this problem too, my taurus overheats because she has to stay at 3rd gear at high revs

the forward control valve could be the problem
http://www.sonnax.com/system/announcement/96206-07K.pdf


http://www.v8sho.com/SHO/Valve%20Body%20Replacement.htm
http://www.sonnax.com/product-lines/transmission/parts/1260
http://www.transmissionpartsusa.com/AX4N_4F50N_forward_control_valve_p/400-09620607k.htm
 

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I had the same problem in my 96 Wagon with the AX4N, it intermittently wouldn't shift into 4th and it threw a p0761 code. So, I pulled the valve body out, and replaced the 3 shift solenoids. (The p0761 code is for a solenoid c malfunction, which controls the 3-4 shift) My forward control valve retaining clip was not broken, but I installed the revised design clip while I had everything apart just to be on the safe side. I've put 3,000 miles on it since then and everything's been fine.
 

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2003 Ford taurus Centennial Edition
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X2...I would also suggest putting the revised/upgraded clip in. When mine wouldn't shift into O/D..I had someone just install the revised clip. I have no more problems.
 
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