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Old 03-19-2006, 09:08 PM   #1
CareTaker
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Default Transmission tech info

Greeting all. I'm a newb to this site, but at 59 years old, have more than decent functional automotive knowledge and skills.

Anyhow, the other day I may have put my foot in my mouth and now I have to put up or shut up.

We were discussing transmissions and the purpose of the trans cooler section of the radiator. Other than being a cost effective and generally functional way of cooling the trans, I stated that it was also the pre warming for a trans in colder climates. It is also one of the reasons B&M makes a thermostat by-pass for AUX coolers, to let the trans get up to temp when an AUX cooler is installed.

So, I'm looking for some kind of validation that I'm right. I have to prove it. Or I have to admit that I'm full of sh___!

I'd appreciate any help from those have have direct technical experience with auto transmissions.

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Old 03-19-2006, 09:31 PM   #2
MaxSL2
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Default Re: Transmission tech info

That is true. That is also often why add-on coolers do not eliminate the in- radiator cooler.

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Old 03-22-2006, 09:08 AM   #3
CareTaker
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Default Re: Transmission tech info

Guess there are no transmission specialists here.

Thanks for listening.

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Old 03-22-2006, 01:39 PM   #4
sps SOHC
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1996 SC2
Default Re: Transmission tech info

Quote:
Originally Posted by CareTaker
Guess there are no transmission specialists here.
Least none that I know of. I'm definitely not one.

...
-96 SC2 gets 35 mpg mix city/hw.

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Old 11-10-2010, 09:53 PM   #5
95-SC2
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1996 SW1
Default Re: Transmission tech info

technically the A/T does not need a "warm up" period.
for example on chryslers equipped with the infamous A604/41TE (A606/42LE)
on extremely cold mornings the TCM will hold it in 2nd gear a bit longer to warm up the fluid.(most others do it too..just using this as an example)
really eliminating the in radiator cooler is optimal in 99% of applications
they are unreliable and DO NOT cool the trans efficiently.
an external cooler is the absolute best way to cool an A/T correctly.
but yes some do have a thermostat built in to hold flow untill the fluid warms up a bit. cold fluid causes harsh shifting (and can cause slips) but thats going to an extremely frigid environment (like -10)

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Old 05-10-2011, 07:21 PM   #6
EricF
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Default Re: Transmission tech info

[QUOTE=CareTaker;786844]Greeting all. I'm a newb to this site, but at 59
We were discussing transmissions and the purpose of the trans cooler section of the radiator. Other than being a cost effective and generally functional way of cooling the trans, I stated that it was also the pre warming for a trans in colder climates. It is also one of the reasons B&M makes a thermostat by-pass for AUX coolers, to let the trans get up to temp when an AUX cooler is installed.

Sir you are correct. the internal "cooler" in a radiator really does very little to any cooling, it's merely a tube going up & down and back out. It is designed for a faster fluid warmup in the cold weather. But depending on where you live.. having the fluid to hot is more detrimental.
If you live in a warm/hot climate, eliminating the internal cooler all together is preferred. the cold day you'll get don't outlast the hot days.. (i.e. Southern California and Arizona come to mind).
Most recomendations for install are to have the fluid go into the radiator, out to the cooler like you B&M then back into the radiator so you complete your loop.
If you tow a trailer, it's pretty essential to have a cooler (a real cooler).
even the factory equipped coolers are better than the ones built into the radiator.
Some coolers go into the radiator and have a tube flowing outward in front of the radiator to get the air flow before heading back to the tranny. It's slightly better, but without fins, the heat can't be drawn away as efficiently.
so you essentially could be re-heating the tube and warming up the fluid even more.

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