Question about 1991 Dodge Dynasty

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1991 dodge dynasty 3.3 automatic transmission will not shift into overdrive. tries 3 times then stays in 3rd. then within a couple miles, the transmission will freewheel down to 30mph then go into 2nd gear and stay.

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Hi,

*Assuming that the OD Switch on the stalk is off, the switch could be defected causing the OD circuit to be defeatured. This does happen!

*Overdrive circuit fuse is open.

*The overdrive switch circuit either open or shorted. Check the connectors at the transmission for corroded terminals.

*Incorrect outputs from the Distance or Coolant Sensors. A punky Distance Sensor can caused a weird collection of symptoms, including no 2-3 shift. If the coolant temperature sensor is bad you will not get a 2-3 shift. If this problem is recent to the winter weather, this should be a prime suspect.

*Incorrect output or intermittent output from the Throttle Position Sensor. On Dodge trucks the Throttle Position Sensor can cause all kinds of problems. Maybe even global warming!

*The Neutral Sense circuit to the PCM is open or shorted.

*The Overdrive Solenoid either shorted, open, or weak. On older 46REs the solenoid plungers became partially magnetized over time causing inoperation.

*The Overdrive Solenoid feed orfice is clogged in the valve body. A very common problem on vehicles that DID NOT receive a reqular transmission filter and fluid maintence.

*Low hydraulic pressure. This can be caused by a number of things, too. But before you suspect the pump I'll bet that the Anti-Drain Back valve in the transmission line is clogged. Some shops clean them, but I would recommend replacing it and changing out the fluid.

*Failed Overdrive Clutch. Unfortunately, this is somewhat common in earlier years, especially vehicles that towed heavy loads or were used in hilly country with the vehilce in overdrive.

*Failure of the Overdrive Piston Seal. Usually not a problem unless very high mileage or Dexron-Mercon fluid was used.

*Clogged Overdrive Check Valve. The result of dirty transmission fluid.

*If this transmission has been "overhauled" or "rebuilt" by an independent and they DID NOT use a Mopar transmission overhaul kit, it is very possible that Overdrive Piston has the incorrect spacer installed.

*PCM failure (the least likely).

Hope this helped.

Thanks for using " Fixya " and have a nice day!!

Posted on Jul 11, 2009

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Posted on Jan 02, 2017

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I have a 91 volvo 740 I am having a problem with the transmission possibly. Its an automatic with only about 150k miles. It starts and takes off in 1st and 2nd but is sluggish and feels like its switching...


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get the transmission serviced and if found in bad condition
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