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Automatic Tranny experts step inside


Autograffiti's Avatar
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09-21-04, 07:39 AM   #1  
Autograffiti
Automatic Tranny experts step inside

I'm wanting to install a tranny cooler like this one:

<img src="http://www.paceparts.com/ProductImages/manufacturer/hughes/images/8255.gif"


and I have a couple of questions.

1. I've been told to totally disconnect from my radiator and use this one exclusively.

-and-

2. I've also been told to install this one after the fluid exits the radiator to further cool the fluid.

3. Can you cool the fluid too much?

I'm inclined to run it in a series in case the fan goes out, I'll still have the radiator cooling.

Any help will be greatly appreciated!!!!!!!!!1

 
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the_tow_guy's Avatar
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09-21-04, 11:14 AM   #2  
Might want to add some additional info, like make/model vehicle, engine size, how you're using the vehicle, where you live (i.e. climbing hills in Colorado or driving mostly on the flat in Iowa).

You are looking at a fair amount of cooling capacity with the pictured cooler. This is for a truck that you use to tow a large boat or RV, maybe?

FWIW the 4L80E trans in my wrecker went 280,000 miles (not a typo) before overhaul, using only the radiator-integral tranny cooler.

 
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09-21-04, 11:58 AM   #3  
I'm certainly no tranny expert but researched enough of my own projects to know that you can overcool an automatic, especially in a cold climate.
Most vehicles use the heat from the engine to warm up the tranny to make the fluid flow in sub-zero temps.


GregH.........HVAC/R Tech

 
carguyinva's Avatar
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09-21-04, 12:56 PM   #4  
most definately...

...you can over cool an automatic...esp if it's electronic and dependent on TFT(trans fluid temp) as an input for shift strategy and convertor clutch control. so...all the questions that tow guy asked are evry pertinent and should figure into your decision to use an aftermarket cooler.

not sure about using engine heat to warm a trans as they produce plenty of their own thru the fluid coupling and friction...but to be fiar they do warm more slowly than an engine, so in very cold climates, there may be some influence there

 
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09-21-04, 02:25 PM   #5  
Ya, I guess most won't be concerned about warming up a tranny.

Here and in a lot of other places in Canada, it is sometimes cold enough to give our tires a flat spot in the mornings.

Don't want to be putting it in drive without a bit of pre-heat.


GregH.........HVAC/R Tech

 
Autograffiti's Avatar
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09-22-04, 04:21 AM   #6  
Autograffiti
Sorry about lack of info. It's a 2001 Jeep Cherokee 4x4 that will be towing light stuff (1,500 lbs max); I live in Houston where it's hot from May-early October. In the summer, heating up fluid won't be a prob.

A few folks on a Jeep forum had suggested a cooler if I had plans to tow a small trailer on a trip.

Thanks for all of the responses....I'm new in here and am already impressed with the info.

Thanks!

 
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09-22-04, 04:43 AM   #7  
yup...

...an air cooler would be fine in that climate...but make it an add-on. don't do away with the factory cooler...in fact, that's never advised unless there has a been a dirty failure of the trans. you don't really need the fan with it...just make sure that it's in the airstream of the condenser/radiator.

 
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09-22-04, 04:44 PM   #8  
transman618
If I were you, considering the climate you live in, I would install your cooler AFTER the radiator cooler for extra cooling like you said. Unless the radiator cooler is obstructed in some way. Your main goal is to keep your trans temp UNDER 200 degrees at all times. I would also use the fan supplied with the external cooler. That will definately help when you tow. Believe me, it wont overcool your transmission in your climate, it also should have a temp sender with it which wont turn the fan on until about 160-180 degrees. To overcool your transmission, you would have to cool the fluid down to under 65 degrees F. With a computerized transmission the trans will not shift into overdrive and the Torque Converter Clutch will not lock unless the trans temp is over 65 degrees F. The computer will not allow it. Good luck with it and let us know how it turns out. Oh yea, you also might want to install a trans temp gage so you can monitor it all the time.


transman

 
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