Tru-Cool Max 40k Transmission Cooler

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

OP
OP
Jlaughtr

Jlaughtr

Full Access Member
Joined
Oct 9, 2012
Posts
255
Reaction score
326
Location
Deming, NM
Uh, concerning what that guy in that video says about the mounting position.....

Cold fluid is thicker than warm fluid, thus why it will only run in the first few larger tubes when it's cold and you don't need all the cooling surface. As the fluid heats up, it thins and flows through the smaller tubes and utilizing more surface.

Kind of an internal thermostat for the cooler.

As for bleeding air, he said it's an open system with a vent and fill/dipstick tube, SO WHAT? It doesn't have to be a sealed system like the cooling system. The engine crankcase is an open system also. There's air in the oil passages, and on top of the heads under the valve cover and when the motor starts it has to push that air out so the oil can flow/drain...what a moron, lol

the small factory one is mounted with the fittings down. I don’t know much about it so I figured I’d post the video but if the website says any way then down is the most natural for the oem lines
 

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
25,998
Reaction score
50,840
Location
Oregon

Found this video explaining that this cooler should be mounted with fittings up. Start at about 27-28 sec
You can find just as many videos stating the exact opposite too. In all reality, real world testing it does not matter. The instructions explicitly state it can be mounted in any position and in fact I actually got through to the tech department at Tru-Cool due to all the people who think they’re internet engineers and post videos like that. They stated indeed it does not matter. If you look hard enough you’ll find the guys who tested them in both orientations and compared trans temps during the exact same conditions and proved it doesn’t matter.
 

08z71bgm

Supporting Member
Joined
Jul 2, 2020
Posts
758
Reaction score
1,108
Location
Long Island, NY
You can find just as many videos stating the exact opposite too. In all reality, real world testing it does not matter. The instructions explicitly state it can be mounted in any position and in fact I actually got through to the tech department at Tru-Cool due to all the people who think they’re internet engineers and post videos like that. They stated indeed it does not matter. If you look hard enough you’ll find the guys who tested them in both orientations and compared trans temps during the exact same conditions and proved it doesn’t matter.
I was skeptical about it. Logic was there but then I figured I’d check the manufacturer and sure enough it states any way you want it’ll work.
 

S33k3r

Full Access Member
Joined
Aug 14, 2017
Posts
2,503
Reaction score
3,445
Location
Dallas, Texas
I do have the RPO code on mine and my cooler is right up front, just behind the grill. I also have code GT4 for the 3.73 gear and I bet that is why I have that cooler.

Did the transmission cooler come standard with the GT4 RPO code?
 

OR VietVet

Multnomah Falls
Supporting Member
Military
Joined
Oct 8, 2014
Posts
20,636
Reaction score
36,242
Location
Willamette Valley
Did the transmission cooler come standard with the GT4 RPO code?

I don't know but it makes sense that with a 3.73 gear the Tahoe could be used more for towing and therefore the trans cooler. For all I know the same trans cooler could be on all rigs with 3.42 gears and the 4.10 gears.
 
OP
OP
Jlaughtr

Jlaughtr

Full Access Member
Joined
Oct 9, 2012
Posts
255
Reaction score
326
Location
Deming, NM
I don't know but it makes sense that with a 3.73 gear the Tahoe could be used more for towing and therefore the trans cooler. For all I know the same trans cooler could be on all rigs with 3.42 gears and the 4.10 gears.

I just looked at my build sheet again. I don't have the GT4 RPO, but I have GU6 which is the 3.42 gears.

I also have this code which explains the Trans cooler:

Z82 - TRAILERING EQUIPMENT INCLUDES: * TRAILERING HITCH PLATFORM * 7-LEAD WIRING CONNECTOR * TRANSMISSION OIL COOLER * HIGH CAPACITY AIR CLEANER
 

Forum statistics

Threads
132,087
Posts
1,862,135
Members
96,554
Latest member
eod_tech

Latest posts

Top