1995 Saturn SL2 shifts hard into overdrive

1995 SATURN SL2
130,000 MILES • 4 CYL • FWD • AUTOMATIC
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LORI4486
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we have put 2 different transmissions into this car and both do the exact same thing them slam into overdrive at the moment we have to electronic plugs unplgged from the front of the tranny becuase if they are pluged in the car wont shift into 3rd could this be the computer? we have checked all the electical componets they all have juice and none of the wires are spliced and all have good conections please give me an answer
Apr 1, 2010 at 9:47 AM
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SATURNTECH9
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Let's start with what yr and model ur donor transmission is from?after that we can move on to the next thing.let me know.
Apr 1, 2010 at 11:16 AM