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.
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.