Transmission Temps??

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Jan 23, 2012 | 10:50 AM

#16

nlemerise

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Joined: Jun 2005

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From: AZ

Quote:

Originally Posted by mueckster

This is the Derale Fluid Control Thermostat Derale Cooling Products 13011 - Derale Performance Fluid Control Thermostats - Overview - SummitRacing.com that I currently have installed to bring up my cold weather fluid temps. I am experimenting with getting my temps up a little higher to aid better mpgs. I have mine mounted to bypass the TruCool and use only the stock coolers until the additional cooling is needed.

Thanks Roland...I appreciate it. Did you see more rapid warming up of tranny fluid?

I'm going to Summit Racing in Sparks, NV this week (Thursday? 1/26/12). If anyone wants one, I am sure it can be shipped by me for a lot less than Summit will charge...I would be willing to pick one up for you. PM me if interested.

Jan 23, 2012 | 11:07 AM

#17

JonathanN

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Joined: Dec 2009

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From: Garden City, KS

So, what would ideally be considered "minimum temperature" if one was to use a thermostat?

Jan 23, 2012 | 11:11 AM

#18

nlemerise

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From: AZ

Quote:

Originally Posted by JonathanN

So, what would ideally be considered "minimum temperature" if one was to use a thermostat?

I do believe (but don't know as fact) that the desired target temperature is 180 degrees.

Jan 23, 2012 | 11:13 AM

#19

mueckster

Lead Driver

Joined: Jun 2003

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From: Damon (South East Texas)

Quote:

Originally Posted by nlemerise

Thanks Roland...I appreciate it. Did you see more rapid warming up of tranny fluid?

I'm going to Summit Racing in Sparks, NV this week. If anyone wants one, I am sure it can be shipped by me for a lot less than Summit will charge...I would be willing to pick one up for you. PM me if interested.

It did somewhat. To truly be more effective in getting the temps up quicker, I would need to have the thermal bypass mounted before all the coolers, or at least before the stock OTA cooler. I'm happy with it so far. The temps are up about 15*-20* more than without the bypass and I am seeing ~ 140* TFT on days above 50* ambient. I was shooting for ~ 150* minimum. Time will tell if I see any benefits in fuel economy. I've only had it on for about a month now.

Jan 23, 2012 | 11:26 AM

#20

nlemerise

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Joined: Jun 2005

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From: AZ

Quote:

Originally Posted by mueckster

It did somewhat. To truly be more effective in getting the temps up quicker, I would need to have the thermal bypass mounted before all the coolers, or at least before the stock OTA cooler.

I'm going to mount mine just after my external transmission filter which will bypass all cooling until the fluid valve closes...

Jan 23, 2012 | 02:25 PM

#21

TXSailor

Senior User

Joined: Apr 2010

Posts: 347

Likes: 3

From: Texas

Interesting comment/direction from Mark K. (one of our Ford FTE Experts).

I have always heard that 220 was not all that healthy so I installed a 31 row (6.0 L) cooler on my 4R100. Even towing my trans temps never hit over 190 now (even in the Davis Mountains of West TX!)

W/O towing, they run a cool 135 to 160. That's all in my Excursion of course so I can't relate to a SD........

D

Jan 23, 2012 | 03:01 PM

#22

FORDF250HDXLT

Fleet Owner

Joined: Jul 2006

Posts: 20,357

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From: Mi'kma'ki

Quote:

Originally Posted by nlemerise

Does anyone remember a write-up where someone put a hydraulic fluid thermostat device in the transmission fluid line?
I've hunted all over and can't find the thread

https://www.ford-trucks.com/forums/1...mperature.html

https://www.ford-trucks.com/forums/7...l#post10773358

Jan 23, 2012 | 03:41 PM

#23

JJFIVEOH

Junior User

Joined: Nov 2003

Posts: 85

Likes: 0

From: Boca Raton

I haven't seen anybody mention synthetic trans fluid. I pull a 40' gooseneck that weighs approx. 12,500 pounds. I switched to https://www.amsoil.com/storefront/atd.aspx and immediately dropped 20°-25°. The worst driving conditions I have put it through was in the middle of August during rush hours traffic, stop and go for 15 miles in 98° heat and the hottest it ever got was 195°. Towing on the highway at 70MPH in the dead of summer the trans temps usually sit around 180°. I was considering upgrading the cooler because I heard the OEM cooler on a 2002 model were poor, but the synthetic fluid fixed everything. I haven't seen it hit 200° in 7 years.

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Jan 23, 2012 | 03:42 PM

#24

nlemerise

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Joined: Jun 2005

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From: AZ

Thanks FORDF250HDXLT for the links. I just finished reading them and from Mark Kovalsky's post in the thread, the IDEAL ATF fluid temperature is 170 degrees.

Jan 23, 2012 | 05:04 PM

#25

Mike Norwood

Elder User

Joined: Aug 2007

Posts: 629

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From: South-Central Kentucky

I never see more than 140* unless I'm towing, and then I've never seen more than190* in 100* ambient. In the winter it never gets more than130*, so I guess I need to cover my cooler up.

Jan 23, 2012 | 05:22 PM

#26

sand_fiend

Laughing Gas

Joined: Aug 2010

Posts: 1,098

Likes: 6

From: Ventura co.

I too have only seen 140 while driving in so cal. Not towing.. I haven't had a chance to tow yet since i put the gauges in..

Jan 23, 2012 | 06:48 PM

#27

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,714

Likes: 2,639

From: SE Florida

Quote:

Originally Posted by nlemerise

Thanks FORDF250HDXLT for the links. I justr finished reading them and from Mark Kovalsky's post in the thread, the IDEAL ATF fluid temperature is 170 degrees.

Yep, I wrote that.