Mishimoto’s new trans cooler installed. - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Performance Parts Discussion Discussion of Performance Parts For the 04.5-05 LLY Duramax Trucks No Advertising

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post #1 of 18 (permalink) Old 09-24-2018, 07:51 PM Thread Starter
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Mishimoto’s new trans cooler installed.

Got my new Mishimoto transmission cooler installed. I’m impressed with the fit and quality. Very happy with it.
IMG_5697.jpgIMG_5701.jpgIMG_5702.jpgIMG_5703.jpgIMG_5704.jpg


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post #2 of 18 (permalink) Old 09-25-2018, 07:54 AM
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How much cooler is your transmission temp under load?

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post #3 of 18 (permalink) Old 09-25-2018, 09:48 AM
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You are running both factory and Mishimoto coolers?

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post #4 of 18 (permalink) Old 09-25-2018, 05:23 PM Thread Starter
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How much cooler is your transmission temp under load?

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I haven’t had a chance to pull the toy hauler with the new cooler. I have a trip planned to the dunes on the 15th of November. I’m thinking at least 30 degrees cooler. Will see.


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post #5 of 18 (permalink) Old 09-25-2018, 05:24 PM Thread Starter
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Quote:
Originally Posted by Ron Nielson View Post
You are running both factory and Mishimoto coolers?


No it replaces the factory one.


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post #6 of 18 (permalink) Old 09-25-2018, 05:50 PM
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I look forward to hearing about your numbers. Have a nice trip.
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I haven’t had a chance to pull the toy hauler with the new cooler. I have a trip planned to the dunes on the 15th of November. I’m thinking at least 30 degrees cooler. Will see.


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post #7 of 18 (permalink) Old 09-26-2018, 08:12 AM
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No it replaces the factory one.
Thanks. Now that I've looked at the pics more closely, I can see that. The long criss-cross hoses fooled me.
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post #8 of 18 (permalink) Old 10-01-2018, 03:51 PM
 
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I was able to get my Mishimoto trans cooler installed this weekend. Installation was relatively straight forward, however I bought better hose clamps than what was provided with the cooler. I broke one hose clamp putting it on so I just decided to replace all of them with bigger clamps. Aside from that, it was a very easy install. I haven't towed with it yet either, but before installing the cooler unloaded my LLY would run about 95 degrees above the ambient temperature. After the Mishimoto cooler install I was at 60 degrees over the ambient temperature on an hour long highway drive at 65MPH - again unloaded. I'm interested to see what the temps do when towing as well.

Thanks -
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post #9 of 18 (permalink) Old 10-01-2018, 05:44 PM Thread Starter
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I was able to get my Mishimoto trans cooler installed this weekend. Installation was relatively straight forward, however I bought better hose clamps than what was provided with the cooler. I broke one hose clamp putting it on so I just decided to replace all of them with bigger clamps. Aside from that, it was a very easy install. I haven't towed with it yet either, but before installing the cooler unloaded my LLY would run about 95 degrees above the ambient temperature. After the Mishimoto cooler install I was at 60 degrees over the ambient temperature on an hour long highway drive at 65MPH - again unloaded. I'm interested to see what the temps do when towing as well.



Thanks -


I had the same results last Friday on a 4 hour drive unloaded. Outside temp 87 degrees stop and go traffic it stayed in the 145-150 and cruising at 75-80 it stayed 132-137 degrees. With the stock cooler it would be in the high 180s and low 190s.


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post #10 of 18 (permalink) Old 11-19-2018, 08:50 PM Thread Starter
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Just returned from my trip to the dunes. Had amazing results with the trans temp. On the way to the dunes pulling a 33 ft toy hauler, left early morning and highest trans temp was 140. On the way back from the dunes the highest temps i reached was 160 this was going up a 7 grade hill and really pushing the truck with engine temps reaching 220. Before the trans cooler my trans temp would also rise with engine temps up to the 220s. I'm glad that i decided to do the trans cooler upgrade. Now i need to do the engine oil cooler so i can keep my oil temps down to help with coolant temps.
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