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  #1  
Old 03-22-2009, 06:38 PM
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Auto Tranny Issue

So I changed my fluid a week ago (I got a tranny slippage alarm, from diagnostics) the alarm was cleared and I have been driving fine on that, or so it seems. I got a temp gauge and a mag hytec pan, and finally put some miles on the new fluid. Before I changed it the temp rarely went over 150 degrees and that was cause I was towing. Now I am on flat ground, not towing and the temp usually stays at 180 to185. When i stop it will go up to 210 or so. What is going on? I am wondering what the normal operating temp is, I thought around 150, but perhaps Im wrong. Also I am wondering if the tranny is still slipping and creating heat, but if so why dont i have any alarms? I am really confused
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Old 03-22-2009, 06:41 PM
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Oh sidenote, the tranny is acting fine, it shifts great.
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Old 03-22-2009, 07:06 PM
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dunno man, i had the slip code and it turned it self off. so no issues yet but im not beatin on yet till it gets rebuilt.
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Old 03-22-2009, 09:14 PM
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Auto Tranny Issue-fluidchart.jpg hope this works Crap in the trans cooler lines? Almost sounds like restricted flow through cooler
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Old 03-26-2009, 05:51 AM
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That is nothing to worry about.
It could be gauge accuracy, or ambient temps playing part in the temp change.
Where is the sensor at?

The spike when stopped is normal, the TC unlocks and the hot fluid gets shot out to the cooler.

Are you run through the cooler in the radiator? If so that will heat the fluid up some.

Being loaded the engine fan is on more, keeping it cooler. Unloaded there is not as much air moving across the tranny cooler.
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Old 03-26-2009, 07:20 AM
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are you sure you filled it to the correct level? low on fluid can cause it to run hot.
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Old 03-27-2009, 03:15 PM
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Quote:
Originally Posted by Deib View Post
That is nothing to worry about.
It could be gauge accuracy, or ambient temps playing part in the temp change.
Where is the sensor at?

The spike when stopped is normal, the TC unlocks and the hot fluid gets shot out to the cooler.

Are you run through the cooler in the radiator? If so that will heat the fluid up some.

Being loaded the engine fan is on more, keeping it cooler. Unloaded there is not as much air moving across the tranny cooler.
I honestly dont think its the temp gauge out of spec, cause it said something totally different before the fluid was changed, and the temp sensor is about mid level on the pan.

I am kinda confused, I talked to a tranny shop and of course the one said, that I would need to rebuild it, due some metal on the drain magnet and black material on the bottom of the pan. I figured that stuff to be normal wear cause it didnt seem like to much. He also was saying that the reason it was fine before was the old fluid had some "clutch material" in it and that would keep it from slipping, when I introduced new fluid it took that "buffer" out of the equation and allowed slippage. Sound logical to me but....... Kinda shady too.
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Old 03-27-2009, 03:17 PM
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Quote:
Originally Posted by thomasinnv View Post
are you sure you filled it to the correct level? low on fluid can cause it to run hot.
That is what i originally thought, and it was a half low but when i added it the temp didnt change any. I at one point thought I used the wrong stuff, but I did not so WHeewww!! Or maybe not that coulda been a quick fix
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  #9  
Old 03-27-2009, 03:34 PM
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Thanks for the graph munks, I was looking for it
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