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Kurt
Dodge Dakota
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10/11/2006
20:36:05

Subject: Overdrive no working when cold (88 3.9l)
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Whenever I first get in my truck in the mornings and after work (sitting for a while) the transmission will not shift into overdrive. After I drive it a few miles and it warms up, everything works fine.
I just replaced the radiator, water pump, 180 degree thermostat and added a transission cooler a few weeks ago. The overdrive worked fine up until a few days ago. The outside temperature did drop here in the past few days and this is when it started.
As far as I know there is no transmission temp sensor on the 88 model ( that was my first guess).
Any help is appreciated.
Thanks
Kurt



Bob Lincoln
Dodge Dakota
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10/12/2006
08:31:48

RE: Overdrive no working when cold (88 3.9l)
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What are the overnight temps in your area? If below 40F, I'd say this is normal.

According to the factory service manual, 4th gear (overdrive) will not engage until the coolant temperature reaches 60F. Lockup will not engage until the coolant temp reaches 140F (right on the Cold line, in my experience). Later models (sometime after 1992) had a tranny fluid temp sensor inline to control this.

Does your temerature sensor operate OK, as seen by the gauge? Any fault codes?



Kurt
Dodge Dakota
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10/12/2006
19:43:24

RE: Overdrive not working when cold (88 3.9l)
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Well it's still warmer here (Texas) than that, it gets to about the low 60's at night.
Today it seemed fine and stayed in overdrive even in the morning. I did notice that my defrost was on causing my A/C to try and kick in. The compresser must be locked up though because the belt started squelling everytime it try to work. I unplugged the compressor and turned the defrost off. Since then it has been fine.
Don't know if that has anything to do with it.
My coolant temp sensor seems fine it stays pretty cool with the 180 thermostat about a 1/4 inch above the cold line when it is fully warm.
Hopefully all is fine now, the truck has been sitting for 10 years before I got it (for $200) and this is pretty much the only problem I've had with it (after changing the fuel pump and the above mentioned stuff), so hopefully I'll be lucky and it'll last a while.
Thanks for the help.



J and J Auto
GenII
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10/13/2006
21:16:39

RE: Overdrive no working when cold (88 3.9l)
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The guage sender and engine temp sensor are 2
differant sensors

Alt side 1 wire guage sender
A/C side 2 wire engine temp sensor if reading
cold it will cause this replace it under $10
Auto Zone

If the sensor is not the prob its a sticky valve
try 1 bottle of lube gard red it will free the
sticky valves

fluid and filter change was done recently I would
assume

good fluid
ATF +3 +4
Amsoil
Redline
no cheap walmart super tech or dextron should be
used in these trans

The ATF +3 Valvoline frome car quest is only
like $1.69 Qt

Larry
J&J Auto

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