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Q: Shudder from a WOT at about 20-25, now the OD light blinks, shifts hard from 1st-2nd and 4th-5th

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I got a used Transmission with about 120,000 installed by a small shop. It shifted well for about 4 months I never really drove hard or anything until this instance. I was behind a turning vehicle on the highway so I slowed to around 20-25 then floored it to take off again. That's when I felt a shutter/shake, ( it was under a mile to home) then the OD light started flashing, although I made it home. The next morning going to work I noticed the light still flashing and it shifted hard between 1st-2nd and 4th-5th. The rest of the gears seem to be fine. After I drove home after work I parked it. I know enough to park it before I really break it. I was asking to see if there was enough of these stories to narrow down my trouble shooting process. I've been reading forums from the explorerforum website but never got a straight answer. I was hoping Torque converter, shifting solenoids or even just low fluid or fluid flush.

My car has 18400 miles.
My car has an automatic transmission.

Based on the information you provided, you certainly have a transmission or torque converter issue. A flashing overdrive light could be an indicator that the torque converter clutch is not working. That can be due to a bad solenoid or possibly a bad overdrive clutch. Further testing by a certified technician, like one from YourMechanic.com, determine if the exact cause of your concern is a solenoid or something else.

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