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  #1  
Old 07-22-2010, 08:14 PM
choatelodge choatelodge is offline
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Hello all. I'm the happy owner of a 2005 1500 Ram Hemi, three years now.
Is it proper form for me to just launch into a question, or is this forum just for intros? I couldn't start a new thread in the 3d gen drivetrain forum and I couldn't find a thread quite what I needed so I came here.

My 1500 must have some sort of tow package because it has a separate tranny cooler and a 2" hitch with a 7 pin round electric coupler.
I added the Teconsha trailer brake and the solenoid so the truck battery power is only enabled to the trailer when the key is on.
Anyway I put in a tranny temp gauge last year and serviced it with synthetic fluid...


...and driving the truck alone the gauge only moves when I'm driving slowly around a hilly area and the torque converter is working, and even then it doesn't get above 130 or so.
But I hooked up my 19 foot trailer (@ 4000 lbs.) and towed it in the hot sun, up some hilly highway country that called for reduced speed on the long grades, and the tranny started getting hot. It would hover around 150-180. Then a stretch of good gravel road on a long ascent at about 30 MPH made it start getting hotter than I was at all comfortable with, and when it hit 210 I stopped, popped the hood and shut it off.
Shut it off because looking at it, I came to realize a couple of things:

- The stock cooler relies on you ramming the truck through the air at highway speed in order to get air through that little cooler! Unless the motor is getting hot, the clutch fan isn't working and there's no air being drawn through that little rad than what is passing through it from the truck's speed.

- Ditto cooling it by running the engine with the truck stopped. Unless the clutch fan is running because the motor is hot, the tranny will only become hotter while stopped and still running the engine. That little tranny cooler doesn't make enough hot air volume to activate the clutch fan, and even if it did it's on the far side of the motor rad. That transmission will slowly cook and the clutch fan will never know about it. As long as the Hemi is doing alright, the clutch fan stays disengaged while the torque converter keeps on creating heat, while no air flows through the cooler.

So I shut it off pronto.
And I did a bit of hunting at the local pick-a-part. Seems like I have the 'standard' cooler and there's a 'heavy duty' cooler they put in the 3/4 ton and 1 tons. My cooler (obviously the standard one) has 10 tubes and the heavy duty one has a whole 15 tubes. OOOooo hold me up, I think I might faint! Five whole more tubes! 50% more cooling capacity. Be still, my beating heart.

In any case I bought one and put it in and then I decided to up the ante, made some brackets and put the old 10 tube one in as well and I siamesed the two, for 25 tubes.
That's 150% more cooling capacity than before.
But am I missing something? Should the tranny have got that hot, or have others encountered this same thing?
Would an electric fan as well, be overkill?

Does everyone's Ram have this movement dependent style rad cooler?

Thanks
-


But am I missing something? Should the tranny have got that hot, or have others encountered this same thing?
Would an electric fan as well, be overkill?

Does everyone's Ram have this movement dependent style rad cooler?

Thanks
-

Last edited by choatelodge; 07-22-2010 at 10:18 PM.
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  #2  
Old 07-22-2010, 08:23 PM
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Glad you joined us and welcome to the Z for Rams from Baltimore . Well with as hot as it's been here for us recently , 210 doesn't sound that bad especially when pulling the load you were pulling . There are tranny coolers with e fans available . If you could go to the top of the page to the User Cp and complete your profile that would be great . Helps us see what you have when your posting a question or comment . Do you have any pictures of your truck ? Have you done any mods or have plans for any ? Any of your friends have Rams ? Tell them about us . We would love to have them . You will find this site is full of a lot of talented people . So if theres any question that you need answered , just shoot away . Talk to ya soon . Tom
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Old 07-22-2010, 08:27 PM
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210 sounds about right for the load.

I think adding an electric fan would be a great idea!
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Old 07-22-2010, 08:32 PM
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Old 07-22-2010, 08:33 PM
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210 is really too hot. I don't like to see them get over 200 tops. I think an electric fan would be a great idea, especially if you used it in a pusher configuration and controlled it with a temp probe set to turn it on at about 190 or so.
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Old 07-22-2010, 09:03 PM
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Hello and welcome!

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Old 07-22-2010, 09:10 PM
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Hello and welcome to the RAMz, looks like you have already got some good feedback. Hope you enjoy the forum........
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Old 07-22-2010, 09:12 PM
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Hello and welcome to the forum, great to have you join us here! Looks like you're getting some good feedback from our resident guru's already, so I'll leave the advice to the experts, but good luck with that! Lots of great people and info here, so feel free to look around and join the conversation! Any help you need, just ask and I hope you enjoy the board!

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Old 07-22-2010, 09:19 PM
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I have the HD cooler and pull a 30ft boat and trailer, with no problems. I dont have a trans temp gauge but theres a trans temp light on the dash so I assume if there was a problem it would light. boat and trailer are around 9000lb and I usually do 60-70mph for about 2hrs at a clip. but i like what u said " ooooo 5 more tubes" lol
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Old 07-22-2010, 09:20 PM
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Welcome to the forum! Glad to have you here!
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