Keeping coolant and transmission temps under control when towing in the summer heat

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alpha_omega

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What gear ratio do you guys have in the rear end? I’m curious about the overall vehicle “stress” while towing and how much the different gear ratios play a role in the whole scheme of things with regards to temps. I know that my set up with the lower ratios supposedly tows better, but does that also help to keep the temps down by not causing everything else up front to not have to work so damn hard?
 

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Geotrash

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What gear ratio do you guys have in the rear end? I’m curious about the overall vehicle “stress” while towing and how much the different gear ratios play a role in the whole scheme of things with regards to temps. I know that my set up with the lower ratios supposedly tows better, but does that also help to keep the temps down by not causing everything else up front to not have to work so damn hard?
3.42 on both of mine.
 
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Geotrash

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Here is the number on the shroud from my 2012. Sorry for the fuzzy photo, but the number is 20923003.
1627414913210.png

And just for fun, here is the shroud number from my 2007. Both trucks are XL Denali's.
1627414967641.png

I also inspected the fan motors on both trucks carefully, and can't find any stickers that show part numbers anywhere on them, top or bottom.
 

Doubeleive

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Yep. That's what it was advertised as anyway.
that fan blade matches the one on this shroud I bought that is supposed to be 700w
I wonder what the backside of a 5 blade non-rimmed 500w fan blade looks like, there must be a design difference between the two more plastic or something on the 700w
 

Doubeleive

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Here's some pics of the part #s on my shroud, left fan motor, and right fan motor.

The left fan motor has the same part# you listed above.

View attachment 345916

View attachment 345917
View attachment 345918

They're Bosch motors, 5 blade non-rimmed blades, and stock non K5L rpo so I'm guessing 500w but they're loud and really blow

@Doubeleive may be curious about this info also
the shroud I bought that is supposed to be 700w doesn't have any room to take a photo like that except right in the back bottom where the harness plugs in but the numbers are not located there on the motor they are in a different spot, plus the plastic from the back of the fan is in the way.
can you take another shot but back up a little bit I can't tell what is shroud and what is fan
 
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the shroud I bought that is supposed to be 700w doesn't have any room to take a photo like that except right in the back bottom where the harness plugs in but the numbers are not located there on the motor they are in a different spot, plus the plastic from the back of the fan is in the way.
can you take another shot but back up a little bit I can't tell what is shroud and what is fan
Don't know if these help

20210727_154429.jpg

20210727_154407.jpg
 

Doubeleive

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had the seller send me a replacement meter still get the same readings 2400-2600 cfm, with the left side being 2600 and right 2400 on high. 7/9 rimmed 700w
meter.jpg
 

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