Upgrade OEM Transmission Cooler

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BrandonH13

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Below 0 temps? Yeah id spend the little bit more for the thermal bypass.
Yeah, Its Kansas lol. We went from almost 98 and 90% humidity to a cold front come through and came down to like 80 with almost no humidity. We have crazy ass weather here.
So I error on the side of caution with winter. It will be in the garage, but I know the wife will only drive it to take the kids to school and pick them up....which is about a mile to 2 miles each way.
 

Addicted

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Any tips or pictures of a bypass installation? I am looking at the TruCool LPD4739 with a bypass.
 

TheAutumnWind

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I'll have to swap out some hard tubes for hose, which doesn't excite me.


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Interesting...

Tru-cool.jpg

I still feel like that might not be enough @ 0*, but for most people it doesn't appear to be necessary.
 

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Tru-Cool LPD4739 with bypass is installed!

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I decided to use the included hose for hookup. I would have done something nicer (AN/Braided or hard lines) but the bypass has hose barbs, so I just stuck with hose barbs and clamps for all of it. I double clamped (and triple clamped one spot) even though the Tru-Cool instruction say not to. Not sure why two hose clamps is worse than one hose clamp. I made sure they were all inside the barbs, which was a tight fit. Because I used hose, I ended up drilling holes down through the plastic and foam behind the bumper. It ended up pretty nice even though I hate the look of all the hose clamps. The bypass fit nicely running front to back under the radiator.

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The hose clamps are all accessible for snugging up over time if necessary, and I even have the ones on the bottom of the cooler pointed so that I can sneak a 1/4" socket with lots of extensions through my grill to snug them without taking the grill out.

I drove it to work this morning, 20 miles at 50 degree air temp, and the transmission got up to 145, where it would only get to 130 or so before. I will be towing my camper on lots of hills this weekend, and I'm hoping I can't make it hit 200.

I blacked out the fittings and hose clamps, as well as the mounting brackets. I think it looks pretty darned sweet. Thanks to others who have done this and given me ideas.

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MSGKUNERT

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I just replaced my factory cooler (07 Yukon Denali XL, 205K) with the Tru-Cool Max 4739 after a trip home to Ohio for vacation and some very high towing temps. I also used the install brackets from Time2Kill which were great. His write-up leaves out a lot for the Denali version which has an extra sensor and needs a few more cuts to make it work.
Temps were around 170-185 on the way to Ohio from Georgia, and didn't go over 135 on the way home pulling a full 6x10' trailer loaded down with a golf cart (2K) and family gear.
I've got pictures on my phone if anybody needs a visual reference.

This is a must do Mod that should have been done long ago.
 

the blur

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With a tranny cooler that big, I'd say your A/C doesn't work as well, and your coolant temps run hotter.
 

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