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Old 03-22-2017, 07:51 PM   #171
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Wish it was an Allison


It's in my truck and the minivan. Can really tell a diff in shifting
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Old 07-28-2017, 11:33 PM   #172
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Well, I sold the Tahoe and bought a 2017 Silverado 1500 with the 6.2L V8 and the 8-speed tranny. We took a drive today in 102 - 104 degree heat through lots of hills. Temp held steady at about 181 degrees. If the temp rose to 185, it quickly went back down to 181, which I thought was very interesting. Cooling system? It does have an external tranny cooler as part of the tow package.
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Old 07-29-2017, 01:17 AM   #173
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I installed one of these on my Silverado. Temp never gets over 180 even towing my 7K# boat up to Lake Tahoe. Before the cooler was installed, I got close to 230.



Made all my stainless lines too.
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Old 07-29-2017, 03:28 PM   #174
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I installed one of these on my Silverado. Temp never gets over 180 even towing my 7K# boat up to Lake Tahoe. Before the cooler was installed, I got close to 230.



Made all my stainless lines too.


Dang it 230 is getting up there even with the synthetic and blends fluid. I have seen mine hit 223 on a 19% 9 mile pull in upper 90 degree NC heat. When i crested the pull she started cooling down quick along with radiator temp it was about the same. I did not notice any fans turning on so it must have not hit that temp yet. I am not sure what that temp is for the extra fans to turn on.
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Old 07-29-2017, 03:53 PM   #175
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Dang it 230 is getting up there even with the synthetic and blends fluid. I have seen mine hit 223 on a 19% 9 mile pull in upper 90 degree NC heat. When i crested the pull she started cooling down quick along with radiator temp it was about the same. I did not notice any fans turning on so it must have not hit that temp yet. I am not sure what that temp is for the extra fans to turn on.
Yep....I immediately changed the fluid after I saw that.

My 1/2T didn't come with the trans temp on the dash so I sent the instrument cluster out to a shop that put one in. Was best investment I ever made.

My truck only has the engine fan.
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Old 07-29-2017, 03:57 PM   #176
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Yep....I immediately changed the fluid after I saw that.



My 1/2T didn't come with the trans temp on the dash so I sent the instrument cluster out to a shop that put one in. Was best investment I ever made.



My truck only has the engine fan.


My 2015 GMC Sierra has it on the DIC but I had to Enable/turn it on. I think i have the one radiator fan then a auxiliary fan that will turn on under load. It was my first time up the grade with 7,000 lbs the 5.3L handled it perfect
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Old 07-29-2017, 08:03 PM   #177
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My 2015 GMC Sierra has it on the DIC but I had to Enable/turn it on. I think i have the one radiator fan then a auxiliary fan that will turn on under load. It was my first time up the grade with 7,000 lbs the 5.3L handled it perfect
That's what I had to do to mine as well. I have it right behind the Trailer Brake Gain Readout monitor (which has to be enabled, too. The newer models of GM trucks and SUVs have twin fans. My old 2014 Tahoe with the 5.3 and 6-speed had twin fans side-by-side. When the temps rise, you can hear them kick on - they are pretty loud unless you have active noise management, then you don't hear very much noise if anything at all.

The new 8-speeds apparently operate at higher temps. I learned from the GM-Truck Forum that the 8-speeds may have an internal thermostat designed to maintain a specific temperature even with an external cooler but no one seems to be able to confirm this. The 8-speeds use synthetic transmission fluid much like the current production 6-speed trannies.

My tranny temp fluctuations occurred while climbing a hill. We'll see how it does under a load pulling the trailer later this summer.
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Old 03-30-2019, 08:24 AM   #178
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My 2015 GMC Sierra has it on the DIC but I had to Enable/turn it on. I think i have the one radiator fan then a auxiliary fan that will turn on under load. It was my first time up the grade with 7,000 lbs the 5.3L handled it perfect
I have a 16' silverado 1/2. How does one go about turning the aux fan on?
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Old 03-30-2019, 08:31 AM   #179
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I have a 16' silverado 1/2. How does one go about turning the aux fan on?
As the post you're replying to is almost 2 years old, and this thread is 8 years old, I'm not sure if you'll get a response.
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Old 03-30-2019, 11:40 AM   #180
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I have a 16' silverado 1/2. How does one go about turning the aux fan on?

It comes on automatically when temps start rising. You can tell it is on when the roar from under the hood increases while pulling a load.
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