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Old 02-28-2014, 01:56 PM   #31
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I would say it doesn't work like that. The COMBINATION of the ratio and coolers is what raises the capacity to 8000lbs. The addition of just one of these would still only give you maybe 500lbs capacity.
Yes, I looked at the 2012 Towing Guide (on Trailer Life site).

The 2012 Yukon XL 1500 4x4 with 3.08 is rated for towing 5000 lb. You may not gain anything with the trans cooler. Best to call a GM service place and check ...

Suburban/Yukon XL 4WD 5.3L V-8 5,000 (b) 3.08
Suburban/Yukon XL 4WD 5.3L V-8 5,500 (g) 3.42
Suburban/Yukon XL 4WD 5.3L V-8 8,000 (g,p) 3.42 plus trans cooler

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Old 02-28-2014, 03:37 PM   #32
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A 1 hour trip on the highway (convertor locked, no trailer, lots of air movement) is not going to give your worst case non-towing trans temp. Get a look sometime when you've been running errands around town, with a decent amount of shifting.

Also, your original post says you have no trans cooling. Not entirely correct. All (nearly all?) automatic transmissions will have a cooling line running the engine coolant radiator, where it will flow thru a bulb-type cooler. The engine coolant circulates around this bulb.
a. When you start the truck on a cool day, the engine coolant will warm up before the trans fluid, so this will help the trans coolant come up to normal operating temp quicker.
b. When trans is getting worked hard, it works the other way. The engine coolant has been cooled by the air flow, and in-turn is able to cool the trans fluid.

You need some auxiliary trans cooling, which will allow the fluid to run thru both coolers. There is debate over which order they should flow. I would say run thru the air-cooler, then the bulb cooler, then back to the trans.
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Old 02-28-2014, 03:59 PM   #33
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A 1 hour trip on the highway (convertor locked, no trailer, lots of air movement) is not going to give your worst case non-towing trans temp. Get a look sometime when you've been running errands around town, with a decent amount of shifting.

Also, your original post says you have no trans cooling. Not entirely correct. All (nearly all?) automatic transmissions will have a cooling line running the engine coolant radiator, where it will flow thru a bulb-type cooler. The engine coolant circulates around this bulb.
a. When you start the truck on a cool day, the engine coolant will warm up before the trans fluid, so this will help the trans coolant come up to normal operating temp quicker.
b. When trans is getting worked hard, it works the other way. The engine coolant has been cooled by the air flow, and in-turn is able to cool the trans fluid.

You need some auxiliary trans cooling, which will allow the fluid to run thru both coolers. There is debate over which order they should flow. I would say run thru the air-cooler, then the bulb cooler, then back to the trans.
If Im not mistaken, all my GM's runs from the trans to rad tank cooler to the air cooler then back to the tranny.
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Old 02-28-2014, 04:06 PM   #34
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If Im not mistaken, all my GM's runs from the trans to rad tank cooler to the air cooler then back to the tranny.
Yeah.. that sounds right (I think!) if I remember what I read recently.. anyway, if that is indeed the order of things; where would you recommend running the trans cooler lines?

Am I wrong to assume a GM service center (which is installing my aftermarket cooler next week) should be smart enough to know where the best place to install the lines would be?
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Old 02-28-2014, 04:24 PM   #35
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Yes, I looked at the 2012 Towing Guide (on Trailer Life site).

The 2012 Yukon XL 1500 4x4 with 3.08 is rated for towing 5000 lb. You may not gain anything with the trans cooler. Best to call a GM service place and check ...

Suburban/Yukon XL 4WD 5.3L V-8 5,000 (b) 3.08
Suburban/Yukon XL 4WD 5.3L V-8 5,500 (g) 3.42
Suburban/Yukon XL 4WD 5.3L V-8 8,000 (g,p) 3.42 plus trans cooler

Yeah, I'm plenty aware of the vehicles towing limitations, and I'm comfortably under those with what I'm towing, I just want additional piece of mind with the trans cooler. On a different RV board there are several posters with the exact same 2012 Yukon XL 4X4 I have with the same 3.08 rear axle as well as an aftermarket cooler added, and they're towing much much larger TT's. I'm not agreeing with that being wise, I'm just hoping to eliminate a little bit of the stress and "white knuckling" when towing in this upcoming and hopefully hot summer, and not necessarily looking for increased lbs I can tow.
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Old 02-28-2014, 04:42 PM   #36
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Yeah.. that sounds right (I think!) if I remember what I read recently.. anyway, if that is indeed the order of things; where would you recommend running the trans cooler lines?

Am I wrong to assume a GM service center (which is installing my aftermarket cooler next week) should be smart enough to know where the best place to install the lines would be?

GM will know how to do it. I did my own on my 98 Silverado. The hardest part was removing the grill. Other then that the kit came with the lines to run.
Can of corn job took me about an hour.
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Old 03-03-2014, 11:30 AM   #37
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I put a Hayden trans cooler on my 09 RAM 1500 when I had my Grey Wolf. Before install trans temps were high - 200-250 and up. after that I installed the Hayden changed/flushed fluid and never saw temps above 170. Those temps were same VA/TN hills same time of year, etc. not scientific but enough data for me to know the trans cooler is a good thing
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Old 03-03-2014, 12:49 PM   #38
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I put a Hayden trans cooler on my 09 RAM 1500 when I had my Grey Wolf. Before install trans temps were high - 200-250 and up. after that I installed the Hayden changed/flushed fluid and never saw temps above 170. Those temps were same VA/TN hills same time of year, etc. not scientific but enough data for me to know the trans cooler is a good thing
Hey, thanks for the response BigTJohn! Would you (or anyone else reading this) recommend I get a full flush/fluid replacement done when the GM service center installs my Derale tranny cooler this Wednesday? I'm currently at about 45,000 miles on my 2012 GMC Yukon XL and my manual says to change the fluid at about 97,500 miles; so I'm well before that. I've only towed with truck a couple times and the tranny temps never got above 175 degrees (granted this was in winter).

I don't mind spending the extra $170 to have this done if it is strongly recommended; but if it's a matter of personal preference only, I'd like to save the $170, too.

Thanks!
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Old 03-03-2014, 12:55 PM   #39
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97,500? Wow, they're really stretching it out.

If the fluid looks and smells good, then leave it be. They'll have to add a couple of quarts when they add the cooler so you'll get some fresh then also.
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Old 03-03-2014, 12:57 PM   #40
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97,500? Wow, they're really stretching it out.

If the fluid looks and smells good, then leave it be. They'll have to add a couple of quarts when they add the cooler so you'll get some fresh then also.
Yeah I was a little surprised too considering older models of the same vehicle had their manuals recommend doing it at 45,000 miles, but mine says 97,500. I'm thinking maybe it's because of some higher grade synthetic fluid they may have started adding to the 2012's and up?
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