Re: 2000 durango shifts out of overdrive when using...
My Durango did the same exact thing. It would seem it was shifting from o/d to third constantly while driving down the road. As it turns out, it was the throttle position sensor. This may or may not solve your problem, but is a good place to start.
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Thinking it's coming out of lockup not actually downshifting, possibly brake pedal switch adjustment,TPS, or lockup solonid is faulty. Notice how you can cruise at 60 and just barely touch the brake pedal,it will come out of overdrive,you can feel it. If you have a tach the lockup will only change the RPM about 500 ,if it was downshifting it would be more like 2000.
I have an 02 Galant LS...I had the same problem with shifting and seemed to idle too fast. I changed out the idle air control motor located around the throttle body area. The car ran great after that. The problem is the IAC is a small plastic motor that will cost around 300 to 400 dollars. If that is the problem then buying a new rather than a used one is recommended.
Durango would shift in and out of overdrive while driving at a steady rate. Replaced the throttle position sensor and fixed the problem. here are a few causes for a bad tps. transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on take off, surge while cruising down highway. have a good day ! tps is used by computer to monitor throttle position and adjust the speed, fuel and air to match throttle position. if tps is bad it will send wrong info. to computer. hope this helps !! if all else fails clean maf sensor. check tps first.
If you are working the gas pedal this will happen or when using cruise control, when you let off the gas it comes out of overdrive and when reappling the gas goes back into overdrive this helps cut emissions
You'll want to doublecheck & make sure the Overdrive is turned on. That's a high rpm for 55, even high I believe for Interstate cruising at 65-70.
Possibly get back to the dealer immediately if it's not the Overdrive switch.
There are issues with some models that concern the RPM staying around 4,000 even at idle & under the right circumstances, a transmission won't shift as it should based upon engine & driving signals that the Trans computer uses to determine when to shift.
Check your fluid first & remember, Overdrive doesn't work until the fluid reaches a certain temperature.