Transmission Gear Slipping Problems of Ford Five Hundred

2006 Ford 500. Transmission slips and bucks while accelerating and braking. The problems occurs alot when the transmission starts to warm up and the temp outside is above 50. It seem to start at about 55000.

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Car fails to down shift when accelerating hard. Transmission slips and becomes disengaged. This prevents me from safely accelerating to pass or avoid other vehicles. Transmission problem are chronic on this 2005 Ford Five Hundred 6 speed transmission.

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I own a 2005 Ford 500 (purchased 9/08 with 32k) currently has 58k; took to dealership last week due to transmission slipping at various speeds on city streets as well as interstate speeds (car jerks erratically); was advised it was a "computer glitch" & dealer charged $80 for diagnostics. Tonight I was driving down a city street when suddenly the car began to jerk erratically again only this time the display panel read "failsafe engine mode" and the check engine light (yellow wrench light) came on; once I got home I shut the car off; restarted it and the display panel cleared but from what I'm reading on different forums is that this could be a multitude of issues; car is under extended warranty; will be taking to dealership tomorrow.

Vehicle shifts hard when hitting passing gear on highway like transmission is slipping or going out. Lose all power and car will buck back and forth. Also does it when transmission down shifts and then tries to upshift when accelerating and engine warm.