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Old 08-11-2016, 02:27 PM   #11
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I really cannot see the need for the extra tranny cooler. I have a 2015 GMC 2500HD gas with the tow pkg and the cooler on it works great. Pulled my unit up 7,8 and 9% grades when out West last year and not once did the tranny get overheated. When u switch to tow/haul mode your gauges change and u get a transmission temp gauge also. I would try it first before putting a lot of $$ into something u really do not need. IMHO
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Old 08-11-2016, 03:47 PM   #12
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Transmission cooler

I would recommend a PPE (Pacific Performance Engineering) tranny cooler. I installed one on my 2005 2500 HD Duramax. I've noticed a significant change in the transmission temps ( around 25-30 degrees) when towing. Regular city driving the temps equalize to the engine temp. I live in Colorado so mountain driving is a test for the truck. I'm towing a 23' XLR toy hauler with a Harley touring bike (FLHTK) and at times a 20' Cargo Mate enclosed car trailer with a 69 Mustang in it. There are several after market coolers for your truck. PPE is a bit more expensive but IMO worth the money.
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Old 08-11-2016, 03:51 PM   #13
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Originally Posted by msrafd View Post
I would recommend a PPE (Pacific Performance Engineering) tranny cooler. I installed one on my 2005 2500 HD Duramax. I've noticed a significant change in the transmission temps ( around 25-30 degrees) when towing. Regular city driving the temps equalize to the engine temp. I live in Colorado so mountain driving is a test for the truck. I'm towing a 23' XLR toy hauler with a Harley touring bike (FLHTK) and at times a 20' Cargo Mate enclosed car trailer with a 69 Mustang in it. There are several after market coolers for your truck. PPE is a bit more expensive but IMO worth the money.
In your case with a 11 year old truck yes you may need it but newer trucks do not require an additional cooler unless your trying to tow more than the truck is designed to tow. Spend your money on travels Later RJD
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Old 08-11-2016, 04:16 PM   #14
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My 2012 Chevy with Duramax/Allison combo seldom hits 165 with the factory cooling even pulling long grades towing.


That doesn't seem right.


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Old 08-11-2016, 04:47 PM   #15
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GMC 2500HD Transmission cooler

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Originally Posted by 325BH View Post
That doesn't seem right.


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It's not.
That a non towing temp.
Pulling my snowmobile trailer in 0 conditions mine reached 170-180 degrees

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2015 nights camped "34"
2016 nights camped "25"
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Old 08-11-2016, 05:11 PM   #16
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My 2015 Duramax pulling a 16,000# 5th wheel runs 125 going down the highway and only gets to 150 going up a mountain grade. No need for a additional cooler.
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Old 08-11-2016, 05:42 PM   #17
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Ok, sounds like I won't need it. We just bought the truck and camper will come in the spring. Just thinking ahead but we'll give it a go first.

Thanks
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Old 08-11-2016, 05:53 PM   #18
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Originally Posted by TURBS View Post
It's not.
That a non towing temp.
Pulling my snowmobile trailer in 0 conditions mine reached 170-180 degrees

2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "25"


What do you mean by 0 condition?

I have a hard time believing these reports (not you) of 150 degrees with a 15,000+ trailer up the mountain.

I was pulling 11,000 lbs in 90 degree weather a few weeks ago. I was 190 in the flats and 210 in medium grades.

Seems like the numbers are very far apart. I know my factory trans cooler is pretty significant.


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Old 08-11-2016, 06:58 PM   #19
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That doesn't seem right.


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I rarely ever even hit 150 degrees on my trans oil with my 2004 Silverado 2500HD while towing a 10,000 gvw tandem axle dump loaded with sand.

Never got to 160 degrees when I used to tow that 98 FR Wildwood 26' 5er.
but I live in Michigan and rarely ever had to drive in 100 degree heat.

So, yes that 160 degree mark can be correct
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Old 08-11-2016, 07:13 PM   #20
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Just in case you still want to, even if not needed. Never enough money, horsepower, or time off work so why not too much cooling.
I like the fan for this reason. Install it on a switch and you can run it for a short while after towing to simply throw air over that hot engine and it components. Why not that's my logic.
So this one it a MITSIMOTO. they are a USA company in DE. Just over $ 100.00 on line. Very happy with mine
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