Upgrade OEM Transmission Cooler

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14SWTahoe

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I wanted to update this one last time for the temps I have been seeing:

Morning: 80F/70% Hum ambient, trans temp runs about 160F

Afternoon time: 95F/ 85% hum ambient, trans runs about 170F

I just added a PML deep trans pan which so far is dropping the temps about 10F.

Keep in mind this is at highway speeds so cooling is much greater. When I hit stop and go traffic the temps will rise roughly 10-20F depending on how long I am in it but top out there.

This morning was the first morning I drove with the trans pan on and was running 150F @80F/65% hum ambient. I had the blessing of having to do stop and go for about 10 minutes this morning (idiot drivers) and maxed out at 170F.

At this point when I start towing, the temps are going to be what they are going to be.

Summary: with upgraded aux cooler and trans pan I see about a 20-40F drop in overall temps in any condition/environment.

If the fluid hits 200F or slightly above it is only for a very short period of time and is cooled back down quickly (trans housing never goes above 160F) so I am not going to worry about it. I will change the fluid more often (every 30K).
 

TheAutumnWind

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I wanted to update this one last time for the temps I have been seeing:

Morning: 80F/70% Hum ambient, trans temp runs about 160F

Afternoon time: 95F/ 85% hum ambient, trans runs about 170F

I just added a PML deep trans pan which so far is dropping the temps about 10F.

Keep in mind this is at highway speeds so cooling is much greater. When I hit stop and go traffic the temps will rise roughly 10-20F depending on how long I am in it but top out there.

This morning was the first morning I drove with the trans pan on and was running 150F @80F/65% hum ambient. I had the blessing of having to do stop and go for about 10 minutes this morning (idiot drivers) and maxed out at 170F.

At this point when I start towing, the temps are going to be what they are going to be.

Summary: with upgraded aux cooler and trans pan I see about a 20-40F drop in overall temps in any condition/environment.

If the fluid hits 200F or slightly above it is only for a very short period of time and is cooled back down quickly (trans housing never goes above 160F) so I am not going to worry about it. I will change the fluid more often (every 30K).

20-40*F drop seems pretty solid to me.
 

TheLoveClaw

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Hey Guys,
First off great thread, love the photo's. We just bought a used 2010 Yukon 3 weeks ago with the HD towing package so we would have a more pleasant towing experience when going camping. We live in Colorado Springs and have to contend with hot summer days, cold winters, and high altitude.

Our camper only weighs 4200# fully loaded and naturally I assumed we would be fine. Went camping last weekend and on the way home (all tanks were empty) the temps were lower 96F and the transmission went as high as 228. When we were driving around in town it was like we weren't using first gear at all. It took a long time to get moving. I brought it back to the dealership and they said everything looked fine. They also said that it's not uncommon for the Denali's and Escalade's to come back from mountain passes with the transmission temp lights on. I want this truck to last for ever and really think I need to add a bigger tranny cooler. I would really prefer the Tru-Cool, but in the winter we can have whole days below 0. Whats too cold? I don't want a thermostat that keeps it at 185 either.
Thanks
 

Smokymance

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i got the 40k GVW cooler w cold ass michigan winters...towing a small 3k lb boat up north and in traffic during summer gets me at about 150° F in the summer when its about 85-90°F out...in the winters, sub zero temps she sits at about 95-100°F....been like this for about 2-3 years and no issues...

w this cooler i dont think iv ever gotten it to see over 160°F...even hot rodding it around w the blower.
 

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