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-   -   Who's running a thermostat w/ transmission cooler (https://www.toyota-4runner.org/4th-gen-t4rs/294100-whos-running-thermostat-w-transmission-cooler.html)

Berty_K 01-18-2021 10:06 PM

Who's running a thermostat w/ transmission cooler
 
First Chicago winter with my external transmission cooler and my transmission (on fresh fluid, did a full exchange) seems to be shifting a big sluggishly.

How many of ya'll are running thermostats/bypass valves with your external transmission cooler? Also, if you are running a external thermostat, which one are you running?

Something like this: Derale 13011 Fluid Control Thermostat

https://ch3301files.storage.live.com...&cropmode=none

Drcoffee 01-18-2021 11:04 PM

1 Attachment(s)
I just put a cover in front of the cooler in the winter. I switched to amsoil synthetic fluid so that its not affected by cold, wont thicken.

Personally I want my ATF to max out at 180*F if the t-stat doesnt open until 180* then my tranny is running at 200*. You have to think the fluid will run thru the radiator first so the t-stat may never open.

Berty_K 01-18-2021 11:20 PM

Quote:

Originally Posted by Drcoffee (Post 3593333)
I just put a cover in front of the cooler in the winter. I switched to amsoil synthetic fluid so that its not affected by cold, wont thicken.

Personally I want my ATF to max out at 180*F if the t-stat doesnt open until 180* then my tranny is running at 200*. You have to think the fluid will run thru the radiator first so the t-stat may never open.


Love the simple solution, and that’s a good point about the tstat opening late.

I’m running Toyota ATF. Should I be concerned about oil thickening?


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81runner 01-20-2021 12:54 AM

I'm running an all aluminum radiator with a trans core and from there to an external cooler. I feel like there's really no way for the fluid to be very cold when it's running thru the radiator that's cooling the engine, but I have a towel to throw over it just in case I see it running super low on the way out of a snowy campsite


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