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Bobmontana

Montana

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Posted: 05/07/22 04:18pm Link  |  Quote  |  Print  |  Notify Moderator

While towing our 3000lb travel trailer with our 2011 Yukon xl 1500 5.3 litre I found that it does ok for the most part but the transmission did get up to 220 degrees going over Macdonald pass in Montana. We were down to 45mph and 3000 rpm just as we crested over and the trans gauge touched 220. Has anyone replaced the stock cooler with a larger one that is a OEM ? I don't like the idea of scabbing in a cooler attatched too the radiator and just rubber hose clamped to the lines. Than you for your time.

Turtle n Peeps

California

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Posted: 05/07/22 04:56pm Link  |  Quote  |  Print  |  Notify Moderator

220 for modern ATF synthetics is not hot at all. Warm, but not hot.

The warning chime for my truck comes on around 265 or 270?

You can put another cooler on as you have said but there really is no reason too. The problem also it if you do cool off the tranny then those BTU's will go into the engine coolant stack and that can cause problems too.

Not saying to not put another ATF cooler in the stack, I'm just telling you some of the drawbacks because very few on this site seems to want to talk about those.


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Lwiddis

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Posted: 05/07/22 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

220F is the upper limit but not excessive IMO when going up a grade with a trailer.


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MitchF150

Puyallup, WA

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Posted: 05/07/22 05:07pm Link  |  Quote  |  Print  |  Notify Moderator

As long as it cools down again when you are not working it hard, then your current cooler is doing it's job.

Your trans probably has an internal thermostat on it anyway.. So, it'll only cool down so much anyway.. Probably around *190-195 range.

If you do decide to get more cooling for the trans, don't add a second cooler... Get a bigger cooler than OEM and leave it all plumbed the same way.

Good luck! Mitch
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Roger10378

Goodrich, MI.

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Posted: 05/08/22 06:51am Link  |  Quote  |  Print  |  Notify Moderator

I like to see trans temperature reach 220 occasionally. Water condenses in the trans oil and needs to be boiled out occasionally.


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Roger10378

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Posted: 05/08/22 06:52am Link  |  Quote  |  Print  |  Notify Moderator

I like to see trans temperature reach 220 occasionally. Water condenses in the trans oil and needs to be boiled out occasionally.

Grit dog

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Posted: 05/08/22 09:58am Link  |  Quote  |  Print  |  Notify Moderator

Roger10378 wrote:

I like to see trans temperature reach 220 occasionally. Water condenses in the trans oil and needs to be boiled out occasionally.


I like your theory, but in 30+ years of driving and exclusively wrenching on all my own stuff and some for others, I have never come across that issue in any vehicle new or old save for maybe one that was severely neglected.
And if it was even remotely an issue, I don’t believe most auto trans mfgs would design them where they ideally Never reach anywhere near that high of oil temperature.


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Grit dog

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Posted: 05/08/22 10:05am Link  |  Quote  |  Print  |  Notify Moderator

8 miles at 8% under a load will clean the cobwebs out of most vehicles.
What temps do you run, say on a 4-6% at highway speeds?
Also, 3000rpms is nothing for a LS motor. If you dropped it another gear, the trans would run a bit cooler.
Now if you’re pulling steep grades frequently which you may be, presume a 6 speed suburban has an external cooler, I’d consider a larger cooler. Or another option, deep pan for more fluid capacity and a bit of cooling with a finned pan may yield similar results.

Microlite Mike

NW Washington State

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Posted: 05/08/22 10:16am Link  |  Quote  |  Print  |  Notify Moderator

Ideal operating temps for modern Automatic Transmissions are from 170F - 225F.

I wouldn't worry about 220F for a short time, especially when climbing a steep grade where temps tend to rise when pulling hard.

One important step when towing is to change fluids more often. Every fluid, engine oil, Atf, Engine Coolant, and Power Steering fluid take a beating under the heat created by towing.

On my vehicle I change Oil every 5K and ATF/PS/Coolant every 50k. So far my 19 year old truck (2004 Titan) tows my 6,000 trailer up anything I've encountered in the West.


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BarabooBob

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Posted: 05/08/22 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

If I were towing with a V8 going up grades in the mountains I shift down to keep the rpm's up. This results in more HP and lower tranny temps. Your V8 probably puts out just over 200 HP at 3000 rpm's. Kick it down, rev it up a bit and you are making close to 400 HP and will top grades at whatever speed you want and the tranny will be cooler.


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