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Old 07-19-2011, 05:35 PM
Twisty Twisty is offline
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Question Over Cooling Tranny Fluid?

Do you think it's possible?
On another forum, a member claims;
"A couple of things happen when fluid is too cool....first condensation does not evaporate, the same as in an engine. Too thick of a fluid (cold) can and will cause cavitation, the same with motor oil
different metals expand at different rates and this will change clearances withinn the trans."
I pretty much agree with that, however, an auto tranny cannot stay cold when operating and I think that the fluid should be cooled as much as possible b4 being returned to the tranny.
A comment also came up about a cooler not allowing flow until the viscosity had changed when the fluid heated up.
I have never heard about ATF having any type of viscosity rating.
I sent an e-mail to Royal Purple asking what is the viscosity of Max ATF.
What do you people think?
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Old 07-19-2011, 05:51 PM
S13minus1 S13minus1 is offline
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Default Re: Over Cooling Tranny Fluid?

it is indeed very possible. coolers should have a thermostat to prevent this
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Old 07-19-2011, 06:14 PM
sgtsandman sgtsandman is offline
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Default Re: Over Cooling Tranny Fluid?

Yes, you can over cool the tranny fluid. Which can cause all kinds of problems. At minimum, have the fluid go into the radiator last before going back to the transmission so the radiator can reheat the fluid to the right temperature but a thermostat would be more ideal.
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Old 07-19-2011, 06:46 PM
01_ranger_4x4 01_ranger_4x4 is offline
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Default Re: Over Cooling Tranny Fluid?

i know overcooling of the trans was an issue on some of the later model F-150's and ford tweaked the system so the temp runs a little higher on the latest model year. They claim they are more efficient and better performing at a slightly higher temp from what ive read.
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Old 07-19-2011, 07:26 PM
Twisty Twisty is offline
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Default Re: Over Cooling Tranny Fluid?

I know my tranny has a cold temperature bypass valve.
You have given me some very interesting info, thanks.
Any other info?
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