Do all 2008's have torque converter oil coolers? - Dodge Cummins Diesel Forum
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post #1 of 10 (permalink) Old 04-04-2019, 04:48 PM Thread Starter
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Do all 2008's have torque converter oil coolers?

My transmission temps were getting higher than I'd like while towing our camper and I was going into limp mode. Long story short, my transmission shop said my truck doesn't have a torque converter oil cooler. Is this true? I've searched but can't find any info on this. I'm thinking my smarty jr. cranked up while towing is putting too much stress on my stock transmission/torque converter. Thoughts? Thanks for your help.


2008 Dodge 3500 SWB, 4x4, Short Bed, Black, Quad Cab, 6.7 Cummins, EGR delete, Smarty Jr., stock auto transmission, Laramie, Leather seats, Stainless Steel Nerf Bars, Recon smoke cab lights, 285/75/17 BFG All-Terrain T/A tires
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post #2 of 10 (permalink) Old 04-04-2019, 07:10 PM
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Do all 2008's have torque converter oil coolers?

Umm you can see it, if you pop the hood, facing the truck itís on the right side sandwiched between the intercooler and radiator iirc. As far as I know they all had them.

Your Smarty Jr. is up all the way, this is foolish on a stock trans, you likely burned it up! The stock trans handles stock engine just fine, but not much more. IMO on a stock trans, 40ish HP over is fine unloaded around town if you keep your foot out of it and maybe when towing if driven correctly.Myself, my 68RFE is stock too, while towing I always put my truck back to stock HP. If the trans is slipping, it needs a rebuild sooner than later, no amount of extra cooling in the world will hold the heat back if itís slipping. You can try backing off you tuner to stock up when towing it might stop the slipping. It might be too late. Pull the fluid stick and smell the fluid, sweet or burnt? Wipe it on a white rag, Nice pink color or dark?


When you tow, are you using the shifter properly? You donít want to tow in 6th gear on anything but flat ground at crushing speeds, this will burn it up fast, 6th is a pretty weak gear not meant for towing, its a MPG unloaded gear. Drop it to 5th or 4th BEFORE you hit the hill, keep the rpms in the 1800-2300 range before you let her rip. These practices will keep the engine and trans happy for a long time.


Also, if your shop told you you missing a cooler when in-fact itís really there, then RUN AWAY FROM THEM. They are idiots or liars.


Hereís the cooler to check for

2008 6.7 2500 4x4 Auto 3.73
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post #3 of 10 (permalink) Old 04-04-2019, 09:49 PM Thread Starter
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I know about the transmission cooler. I'm asking about the torque converter cooler. 2007 and older, I believe, had a transmission and torque converter cooler...2 separate things. Also it's an automatic...sorry didnt have that in my sig. My shop told me Dodge didn't put this cooler on 2007.5 and up. Is this true?

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post #4 of 10 (permalink) Old 04-04-2019, 10:02 PM
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For towing duties it's a good idea to have an auxiliary cooler, or a bigger one like Mishimoto sells.

03 Dodge SHO CCLB Dually Carli/Thuren Argon filled Shocks, radius arms, SRW 4 link Conversion, 17"methods, 42" Goodyear MTR Kevlar Tires / 6 in a row ready to tow!
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post #5 of 10 (permalink) Old 04-05-2019, 12:27 AM
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Do all 2008's have torque converter oil coolers?

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Originally Posted by ramoffroad View Post
I know about the transmission cooler. I'm asking about the torque converter cooler. 2007 and older, I believe, had a transmission and torque converter cooler...2 separate things. Also it's an automatic...sorry didnt have that in my sig. My shop told me Dodge didn't put this cooler on 2007.5 and up. Is this true?


What exactly is the difference? What is it cooling? The fluid? Torque converter cooler, trans cooler, trans radiator, all the same thing. I guess one could call it a TC cooler because the hot line out of the trans is right after the TC? I guess..

My guess is what they are calling a TC cooler is the heat exchanger on the passenger side of older 5.9 trucks. This was just a additional cooler inline with the front cooler. But it was fluid to fluid (coolant/atf) vs the air to fluid exchanger in the front. It did both help control the heat spikes when running unlocked and helped warm the trans up in cold weather. I did pretty extensive testing with and without the heat exchanger in the loop on my 5.9. With it I got to 170-180 fast, but it was slower to rise up past 200 than without it. That truck needed it! No lockup in lower gears and it took forever to get to higher ones, that trans made some heat! Never seen anyone add one to a 68rfe. On our trucks dodge ditched the problematic exchanger for a cooler up from thatís 2-3x bigger than the one on the front of the older trucks.

You donít need anything more than the stock cooler if your truck is stock and towing loads itís made for and the trans is holding good. I have towed the piss out of mine for pretty long runs, including WOT pulling grades at 75-80 in 5th gear. The trans never got a above 190, and I read 6Ē from the hot line output with my ISSPRO. Again when towing right and use it the gears. Honestly, a trans tech telling you adding one will solve the problem is a fool imo.

Now if your towing too much, or sending too much extra power down the line, I guess more cooling could help a stock trans out a little, but really your on borrowed time doing that, the cooler is just extending the slow death of the trans a little by helping to not baking the ATF, itís doing nothing for the holding power of the trans and once you glaze over those clutches real good your done.

Side note, when extra coolers really help is putting around in town from light to light at slow speeds with no lockup. Thatís the only time my trans sees 200 on the hot out haha.

Quote:
Originally Posted by Gator1 View Post
For towing duties it's a good idea to have an auxiliary cooler, or a bigger one like Mishimoto sells.

That Mishimoto is nice isnít it! Iíll get one when I have to get the trans rebuilt and upgraded, just because, more capacity, quality and factory fit! I still donít think extra cooling is the OP problem though. Towing with the J-67 on the 100hp is a death sentence for a stock 68rfe, unless you are very very aware of the power your running thru it at all times.

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post #6 of 10 (permalink) Old 04-05-2019, 07:39 AM
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This is the converter cooler. I'm not sure if they all have them but I do know of a '05 that has one that I've replaced before because it was leaking. I'm thinking that it just helps the transmission cooler keep the oil temps in check???


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post #7 of 10 (permalink) Old 04-05-2019, 09:02 AM
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Quote:
Originally Posted by Babin Farms View Post
This is the converter cooler. I'm not sure if they all have them but I do know of a '05 that has one that I've replaced before because it was leaking. I'm thinking that it just helps the transmission cooler keep the oil temps in check???


https://www.wholesalepartsexpress.co...68004317AA.jpg
If you want that to work as a trans "cooler" just disconnect the hot water hoses from it otherwise it's a trans heater!

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post #8 of 10 (permalink) Old 04-05-2019, 10:28 AM
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Quote:
Originally Posted by Gator1 View Post
If you want that to work as a trans "cooler" just disconnect the hot water hoses from it otherwise it's a trans heater!


Yup those are exchangers. There both cooler and heaters, since the fluid going into them is coolant. On my 2000 I measured the coolant at 160 going into the exchanger when the truck was up to operation 190*. So itís a heater under the trans overcomes the coolant temps, then itís a cooler.

But yea, those are not on our 6.7s.

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post #9 of 10 (permalink) Old 04-05-2019, 10:34 AM Thread Starter
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Thank you very much for the information. That is exactly what I needed to know and hear! I'm going to tow on a lower setting on the smarty to see how that goes. It all makes perfect sense. Thanks again!

2008 Dodge 3500 SWB, 4x4, Short Bed, Black, Quad Cab, 6.7 Cummins, EGR delete, Smarty Jr., stock auto transmission, Laramie, Leather seats, Stainless Steel Nerf Bars, Recon smoke cab lights, 285/75/17 BFG All-Terrain T/A tires
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post #10 of 10 (permalink) Old 04-05-2019, 12:06 PM
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Do all 2008's have torque converter oil coolers?

Quote:
Originally Posted by ramoffroad View Post
Thank you very much for the information. That is exactly what I needed to know and hear! I'm going to tow on a lower setting on the smarty to see how that goes. It all makes perfect sense. Thanks again!


Good luck to you sir, I hope the issue was cought early enough and just goes away. I re-tune mine back to stock with deletes 2 days before I tow to lets the trans do its learning before I hook up weight. I have towed with the SW2 before but only because they were close trips I knew i wouldn't be working the truck hard to get there.



EFI live with the CPS switch would be sweet, maybe when I get to Texas and toss on studs.

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2000 5.9 3500 4x4 Auto 4.10 (sold)
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