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I am the original owner of a 2003 Ford Expedition Eddie Bauer with 140,000 miles. Two days ago, I noticed that the transmission attempted to shift to 3rd gear... but would not engage (it dropped into Neutral). When I added gas, the RPM revved up to 4500 RPM when the transmission finally dropped back into 2nd Gear. It drives and shifts smoothly in reverse, 1st, and 2nd gears with no abnormalities noted. With O/D OFF selected or "2" selected on the shift selector, the car drives in 1st and 2nd gears only... up to 60 MPH at 4500 RPM. I replaced the Transmission Fluid and Filter... all looked clean with only minor micro-dust size particles in the fluid and a nice vibrant red color. Does anyone know what else can I do before sending it to a Transmission Shop for a costly rebuild or replacement???
You're pretty much at the point where you'd need diagnostics to go any further--that is, pressure testing and using a scan tool to activate and test solenoids, etc. At 140K, internal wear is certainly possible and slippage is never a good sign.
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