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07.5 - 09 3rd Gen 6.7L Performance Parts Discussion Discussion of Performance Parts For the 6.7L Trucks...NO ADVERTISING

Thread: Mishimoto R&D - 3rd Gen. 5.9L / 6.7L Transmission Cooler Reply to Thread
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  Topic Review (Newest First)
05-21-2019 04:35 PM
Mishimoto
Quote:
Originally Posted by Cheaterpipe View Post
Thought Iíd throw in my 2 cents worth.

Long before I found the R&D 3rd gen post from Mishimoto, I had already added two aftermarket trans cooler. Based off of my endless searches and reading, I purchased an Derale cooler with a fan and mounted under the truck similar to what other Ram owners are doing. I had also replaced the front OEM cooler with a Derale unit also. The front cooler was roughly half the size of OEM, but I ran with it any way. During that time, I purchased and installed an Edge Insight monitor with trans temp displayed. Not knowing any better, I thought the broad temp swings from 140 with low 40 degree ambient to 212 stuck in stop-n-go traffic with low 90 ambient temps were normal. That all changed when I finally got around to installing the Mishimoto cooler. On the coolers first run, I hooked up to a 22ft car trailer with an non running F-150 strapped to it. Also, as a way to move said broke down Ford, in the bed of my truck was a 4x4 Polaris ATV. The highest trans temp I saw was 171 in stop-n-go traffic and once up to cruising speed (65 to 70ish) the trans temp was down in the low to mid 130ís. The ambient temperature that day was in the low 80ís. With the Mishimoto up front and Derale down below, my temps dropped on average 40 degrees +/-. Mishimoto did a heck of a job with this cooler and am darn glad itís there.
We appreciate you taking the time to write your review!

-Justin T.
05-14-2019 10:24 PM
Cheaterpipe
Meant to post this in 3rd gen 5.9 section. Think it would apply to 6.7 owners also.

Thought Iíd throw in my 2 cents worth.

Long before I found the R&D 3rd gen post from Mishimoto, I had already added two aftermarket trans cooler. Based off of my endless searches and reading, I purchased an Derale cooler with a fan and mounted under the truck similar to what other Ram owners are doing. I had also replaced the front OEM cooler with a Derale unit also. The front cooler was roughly half the size of OEM, but I ran with it any way. During that time, I purchased and installed an Edge Insight monitor with trans temp displayed. Not knowing any better, I thought the broad temp swings from 140 with low 40 degree ambient to 212 stuck in stop-n-go traffic with low 90 ambient temps were normal. That all changed when I finally got around to installing the Mishimoto cooler. On the coolers first run, I hooked up to a 22ft car trailer with an non running F-150 strapped to it. Also, as a way to move said broke down Ford, in the bed of my truck was a 4x4 Polaris ATV. The highest trans temp I saw was 171 in stop-n-go traffic and once up to cruising speed (65 to 70ish) the trans temp was down in the low to mid 130ís. The ambient temperature that day was in the low 80ís. With the Mishimoto up front and Derale down below, my temps dropped on average 40 degrees +/-. Mishimoto did a heck of a job with this cooler and am darn glad itís there.
04-14-2019 12:20 AM
Gator1 I'm managing to keep the pan temp @160 with just one small aux cooler with a fan, and no radiator mounted cooler. So I'm sure once I hook that up it will be good to go. I got a rad mount one that's 2in thick!
04-13-2019 10:40 PM
DGrossman I just mounted a Derale 15870 today. I havent plumbed it in yet.
The mishi rad mount cooler does help some but my problem is stop and go.

If I can keep it around 180-190 doing that in the heat, I'll be happy.
04-13-2019 08:50 PM
s10010001
Quote:
Originally Posted by Gator1 View Post
I want to stay as far away from 200 as possible. My trans shifts the best when it's cold, the hotter it gets it starts acting up. I was going to put a Mishimoto on it, but they're all back ordered until summer sometime. So I'm putting a smaller, but thicker (2in) thick Derale with no thermostat on it @ 1/2 the cost of a Mishimoto. If that doesn't handle it I'll try a Mishimoto when available.


Itís all about where your measuring from. 200 on the internal sensor is not bad, mine would get there pretty easy. I read from the hot line out with an isspro ev2 and itís about 10-20 cooler than the internal iirc. I donít have the device I was using to read the internal temp sensor anymore. If your having issues like that extra coolers is likely just band-aiding the problem, thereís likely something wrong with it.

I say put a sensor on the hot line out then go from there. The internal sensor is kinda silly to read from since you do know where itís reading from and how much heat soak is in that area. Hot out gives you the best idea of whatís happening. It reacts so fast, you can see heat output in each gear and watch it drop like a rock on lockup. Great diag tool.
04-13-2019 07:41 PM
Gator1
Quote:
Originally Posted by s10010001 View Post
Over 200 on the internal sensor is not really anything to worry about. 200 in the pan is a problem.
I want to stay as far away from 200 as possible. My trans shifts the best when it's cold, the hotter it gets it starts acting up. I was going to put a Mishimoto on it, but they're all back ordered until summer sometime. So I'm putting a smaller, but thicker (2in) thick Derale with no thermostat on it @ 1/2 the cost of a Mishimoto. If that doesn't handle it I'll try a Mishimoto when available.
04-13-2019 07:17 PM
s10010001 Over 200 on the internal sensor is not really anything to worry about. 200 in the pan is a problem.
04-13-2019 06:57 PM
Gator1 Next step is mounting a smaller 40 row Derale cooler to the radiator, and I'm betting it will handle all the hot summer 120+* heat with both coolers in use. Hopefully well below 170* even on the hotest days.
04-11-2019 06:12 PM
Gator1 Did a little test today after finally wiring the fan to the thermostat. Last time I drove it with just a standalone aux cooler it got hot/over 200 deg in about 10 mins. Today I went 2x as far all in city stop and go driving with the fan connected, and 80 deg out, and it kept the temps @ or below 180* on the smarty display, and 160* in the pan. Not too horrible for having no radiator mounted cooler.
04-10-2019 07:13 PM
TWR Hi 20 degrees hotter on the smarty compared to the pan gauge is about right. Yes you should be fine, i still may need to add a remote cooler with a fan because their is no room to mount a fan in front of the mishimoto trans cooler.
04-10-2019 07:06 PM
Gator1 My Smarty reads about 20 deg hotter than my pan. Since my stock cooler failed with a plugged return line check valve i've been looking to improve the trans cooling and running just a dual stacked remote cooler but it's no where near able to be a standalone cooler so I'll be adding a Mishimoto with no thermostat and starting over with a fresh trans. That should keep things chilly enough when combined together.
04-10-2019 01:03 AM
s10010001 Where you read the trans temp from matters too, the internal (ecu) reads pretty hot compared to the pan. Hence why the built in trans temp warning light is something stupid high like 280. Too late IMO, but I get the logic

I like reading from the hot line out of the trans myself. Good baseline of the heat the trans is making and it responds very very fast to changes in the trans, like lockup.
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