Mishimoto R&D - 3rd Gen. 5.9L / 6.7L Transmission Cooler - Page 10 - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7L Performance Parts Discussion Discussion of Performance Parts For the 6.7L Trucks...NO ADVERTISING

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post #109 of 126 (permalink) Old 04-09-2019, 08:06 PM
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Any new feedback on this? I'm thinking if this thing works unless you're living in a very cold climate it would be best to have no thermostat? The cooler the better. But how much difference if any is it making???


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post #110 of 126 (permalink) Old 04-09-2019, 11:35 PM
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Originally Posted by Gator1 View Post
Any new feedback on this? I'm thinking if this thing works unless you're living in a very cold climate it would be best to have no thermostat? The cooler the better. But how much difference if any is it making???
Hi i have mine in for 6 months and i had problems with the thermostat so they sent me a new one and it was a very small bit better. I live in a cold cilmate and with the thermostat in when is was about 14F to 30F outside and in a 15 minute drive home from work in normal city traffic it got over 180 to 200 degrees and that thermstat is a 160 degree and not much air flow in the city with traffic lights but it should modulate and not get as hot as it was. Out on the highway is was fine around 160 to 170. I believe having the thermostat in it has to much reduced flow not enogh air flow for city driving. I have took the thermostat out and its a bit warmer outside here now 45F now and the same drive home from work its 130 to 140. I do have number 8 line right from the trans to the cooler and back, i deleted the plate cooler. I will see how it is when its gets up to 90 degress here i think it will be fine by how it works without the thermostat. Maybe someone else will chime in thats using the stat and without. I have a autometer trans gauge in the pan and also a smarty touch reading off the Transducer they are within 10 to 20 degrees of each other.
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post #111 of 126 (permalink) Old 04-10-2019, 12:28 AM
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It would be nice if it could hold the summer temps @ 170 or below then an aux cooler with a fan may or may not be needed. Thanks for your review!

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post #112 of 126 (permalink) Old 04-10-2019, 12:30 AM
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No problem Gator, i hope someone using the thermostat had better luck with it than me.

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post #113 of 126 (permalink) Old 04-10-2019, 12:49 AM
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What did you have to do to get your Smarty to read the temps? I have the same set up, one in the pan, and a Smarty Touch.

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post #114 of 126 (permalink) Old 04-10-2019, 12:54 AM
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hi go to pid then scroll down to transmission then sump temp.

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post #115 of 126 (permalink) Old 04-10-2019, 01:03 AM
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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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post #116 of 126 (permalink) Old 04-10-2019, 07:06 PM
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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.

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Last edited by Gator1; 04-10-2019 at 07:13 PM.
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post #117 of 126 (permalink) Old 04-10-2019, 07:13 PM
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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.

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post #118 of 126 (permalink) Old 04-11-2019, 06:12 PM
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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.

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Last edited by Gator1; 04-11-2019 at 06:18 PM.
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post #119 of 126 (permalink) Old 04-13-2019, 06:57 PM
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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.

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post #120 of 126 (permalink) Old 04-13-2019, 07:17 PM
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Over 200 on the internal sensor is not really anything to worry about. 200 in the pan is a problem.

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