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my 93 aerostar did this, my problem ended up being the modulator valve on the transmission, a 13.00 dollar part at autozone, it was sucking tranny fluid into the motor, wouldn't shift right and was running terrible. you can tell if this part is bad by simply getting under the van, find the transmission pan, on the passenger side, on the pan lip(hard to see on a 93) there is a small hose connected to it, pull it off, if tranny fluid is in that hose valve is bad Another possibility is that the torque converter is bad. Thanks for answers. Oddly enough I replaced a fuse and overdrive worked??? *Where is that fuse located?*

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โˆ™ 2008-01-08 01:12:50
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Q: What causes a Ford Aerostar XLT not to shift into overdrive and stay in third gear no matter what speed you go?
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