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Old 06-01-2019, 04:54 PM   #1 (permalink)
gos5
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Which Trans Cooler for Allison 5 speed?

Hello all. I'm in need of a trans cooler for my 2005 Silverado Duramax Dually with 5 speed Allison. Towing my 5th wheel, I'm around 24k lbs combined and have seen the transmission temps go over 200 degrees on several occasions, mostly low speed and slight grades. Truck just turned 50k miles and I've probably changed the fluid and filter a half dozen times worried about cooking the fluid. I only use the Allison filters and Transynd fluid. There are two coolers that I've seen a lot of post on and wondering which is the better cooler between the PPE and Mishimoto? While the Mishi is a little more expensive, it appears to have more surface area. Going to order one this week since I have another trip in a couple weeks.
Thanks for any input...

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Old 06-02-2019, 06:28 AM   #2 (permalink)
68ss
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I installed the mishimoto last fall. I have waited to post about it until I started back camping and towing in the heat. Empty the transmission temp would run 100 over ambient and towing I have seen it go to 120 over ambient. Since I installed the new cooler the temp runs ambient plus 60 so it dropped 40 degrees off of the temp and towing I run ambient plus 80. For me it was worth the expense.

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Old 06-02-2019, 11:48 AM   #3 (permalink)
enahs
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See if Mike L coolers are still available. High quality, fits, and works. Also, deep pan, stock Allison item, may help. https://inglewoodtransmission.com/jm1/ Give Mike a call. Best way to get in touch with him.
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Last edited by enahs; 06-02-2019 at 11:50 AM.
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Old 06-03-2019, 07:34 AM   #4 (permalink)
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Quote:
Originally Posted by enahs View Post
See if Mike L coolers are still available. High quality, fits, and works.
There still available. Our vendors have them for $359.99

Last edited by Rvn4me; 06-03-2019 at 07:35 AM.
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Old 06-03-2019, 12:25 PM   #5 (permalink)
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Is the Mike L cooler and the PPE the same cooler? I thought I read that somewhere.
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PPE transmission cooler
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Old 06-03-2019, 05:23 PM   #6 (permalink)
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Quote:
Originally Posted by 68ss View Post
I installed the mishimoto last fall. I have waited to post about it until I started back camping and towing in the heat. Empty the transmission temp would run 100 over ambient and towing I have seen it go to 120 over ambient. Since I installed the new cooler the temp runs ambient plus 60 so it dropped 40 degrees off of the temp and towing I run ambient plus 80. For me it was worth the expense.
I have the Mishimoto trans cooler on my LLY and had similar results to what 68ss had above. It has been a significant difference over stock. Either way I'm not sure you can go wrong with either of the two you are looking at.

Good luck with whichever you choose.
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Old 06-04-2019, 08:56 AM   #7 (permalink)
Rvn4me
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Quote:
Originally Posted by gos5 View Post
Is the Mike L cooler and the PPE the same cooler? I thought I read that somewhere.
Yes
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Old 06-04-2019, 01:05 PM   #8 (permalink)
BoiseRob
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Quote:
Originally Posted by gos5 View Post
Is the Mike L cooler and the PPE the same cooler? I thought I read that somewhere.

NO... MikeL's is the top one...
Attached Images
File Type: jpg mikelcooler.jpg (66.9 KB, 9 views)
File Type: jpg performance_transmission_coolers_06-10_1.jpg (20.5 KB, 30 views)
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Old 06-05-2019, 08:34 AM   #9 (permalink)
Rvn4me
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Post #5 right from the horses mouth. https://www.dieselplace.com/forum/57...on-cooler.html

PPE PERFORMANCE TRANSMISSION COOLER
https://www.xtremediesel.com/ppe-per...mission-cooler

Last edited by Rvn4me; 06-05-2019 at 08:47 AM.
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Old 06-05-2019, 11:40 AM   #10 (permalink)
BoiseRob
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Quote:
Originally Posted by Rvn4me View Post
Post #5 right from the horses mouth. https://www.dieselplace.com/forum/57...on-cooler.html

PPE PERFORMANCE TRANSMISSION COOLER
https://www.xtremediesel.com/ppe-per...mission-cooler

Wow... and I got the pictures from their websites...

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