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Old 12-12-2010, 09:43 PM   #1
1990 GT-X
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2001 Automatic Trans Problem

I have an 01 SE with an SPI automatic in it. When the car is cold and i drive it in overdrive is will clunk and jerk like in and out of gear, but when i take it out of overdrive, it shifts and drives fine. the minute i put it in overdrive again, it will shift into overdrive just fine and maybe drive for 30 seconds or so before it starts jerking really bad, then i take it out of overdrive and it runs fine. Now it only does this within 20-30 mins of driving it. once i drive it for this time and it gets really warmed up, then it stops doing this. i can drive the car all day after warmed up and it will not do this all day, but once i let the car get really cold, this starts all over again. Now i replaced all the solenoids being told this is what it is and it didn't change. Anyone have an answer for this.


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Old 12-14-2010, 11:55 AM   #2
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B U M P No one knows about tranny's. Come on now.
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Old 12-14-2010, 12:32 PM   #3
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I'm not sure if it's the transmission or the electric controls to the transmission. There should be a transmission controller computer under the back seat on the driver's side. Check out the wiring harness, and make sure that the black wire that comes off that harness is connected to a ground. Also check your grounding wires from the neg battery terminal to the chassis. Your problem might be with the switch and not the transmission or the solenoids. If you can disassemble the shifter to clean the switch on the shifter- I'd consider doing that. Dust and crud might've caused corrosion over time that is preventing the signal.

That's my best guess.
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