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OT - truck trans temp?
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Eric[IL] View Drop Down
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Joined: 14 Sep 2009
Location: Illinois
Points: 485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric[IL] Quote  Post ReplyReply Direct Link To This Post Topic: OT - truck trans temp?
    Posted: 04 May 2011 at 6:32am
Does anyone know what is a normal manual transmission temperature?  I am running 2 big electric fans on my 2000 Ford F350 truck radiator.  It is now equipped with a 5.9L 12V cummins and I am seeing a 180-190 F range on its 6spd manual trans.  The reason I ask is that I could mount a 3rd electric fan for the trans if necessary.  I have no prior knowledge of what is normal for a transmission temp. 
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Bob D. (La) View Drop Down
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Joined: 12 Sep 2009
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Points: 25529 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bob D. (La) Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2011 at 6:34am
Seems I always thought the goal,at least for automatics was to keep temp below 250 degrees.
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 23846 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2011 at 7:03am
Does your manual tranny actually have 'plumbing' connecting it to a cooler in the rad? If so, that's new to me!
I've always added an extra cooler to my automatic vehicles with trailer hitches,figuring $50 now was better spent than a couple thousand later.
 
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Dave in il View Drop Down
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Joined: 22 Sep 2009
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Points: 1748 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave in il Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2011 at 8:49am
If it has a trasmission cooler you would have more luck adding a larger cooler rather than another fan. If you engine is running normal operating temps and your manual trans doesn't have a cooler then adding more fans won't make a difference.
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Brian Jasper co. Ia View Drop Down
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Joined: 11 Sep 2009
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Points: 10508 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2011 at 1:05pm
I forget right off when they started doing it, but yes, Ford does use the same radiator cooler for the automatic trans on a manual. That being the case, I'd say it's not too far off. Just be sure you're using the correct fluid for the trans. Many times it's ATF...
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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John (C-IL) View Drop Down
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On my Freightliner the trans temp will usually get to be very near the engine temp. I know they are two different trucks, but I wouldn't think that 180 t0 190 would be out of line. The important part is if the oil you are using is good for that temp level.

Edited by John (C-IL) - 05 May 2011 at 6:40am
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Eric[IL] View Drop Down
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Joined: 14 Sep 2009
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Points: 485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric[IL] Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2011 at 10:09pm
Yes, the truck was built at the factory with a transmission cooler (fin core) that is positioned in front of the engine radiator.  Yes, it has the correct transmission oil.  I guess the transmission has a pump that circulates its fluid thru the cooler?  Today, I was running loaded (pulling a 27' gooseneck trailer) and the trans temp leveled off at 210 F degrees.  So, it sounds like it is within a normal range.  Thanks everyone for your input. 
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427435 View Drop Down
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Points: 18637 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 427435 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2011 at 10:31pm
What oil is spec'd for the transmission?  Is it a synthetic??

My MH (2000 V10 with 4 speed auto) normally runs around 160, but will climb to 210-220 on a long uphill pull.  The GCW is around 26,000 lbs and I'm using Mobil 1 ATF.
Mark

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