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Old 07-15-2011, 04:22 AM   #11
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Don't forget it is combined weight to size these, truck and trailer with contents.
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Old 07-15-2011, 04:23 AM   #12
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Check around on the WEB for pricing once you select a model
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Old 07-15-2011, 05:40 AM   #13
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Just priced one for my Avalnache, $258 installed. The coolers vary in price like everything else, have seen the from under $100 to over $300 for just the cooler.
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Old 07-15-2011, 05:46 AM   #14
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Quote:
Originally Posted by bikendan
i'm a little confused. i have an '07 Avalanche, the same GM900 platform as the Tahoe/Yukon. in fact, it's the same as the Suburban, without the back seats.

my '07 Avy's factory tow package came with a tranny cooler, pre-wiring for a controller, 3.73 rear end, 7-pin connector and type III/IV hitch receiver.

did something change that they now offer two different factory tow packages?
Have an Avalanche as well, this is my understanding from several other Avalanche owners.. The radiator in the tow package has an extra fin or two and Cherolet says it is equipped but that is not the same as an auxiliary cooler.
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Old 07-15-2011, 06:16 AM   #15
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The radiator core thickness is only to help cool the engine better and has nothing to do with a tranny cooler. Some radiators have coolers built in, but if the water is at 200 plus degrees than the tranny fluid is no cooler, hence the external coolers in front of the radiators.
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Old 07-15-2011, 06:56 AM   #16
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Quote:
Originally Posted by Fourn3833
The radiator core thickness is only to help cool the engine better and has nothing to do with a tranny cooler. Some radiators have coolers built in, but if the water is at 200 plus degrees than the tranny fluid is no cooler, hence the external coolers in front of the radiators.
No argument from me about what you are saying. But apparently Chevrolet has made it sound as if the Avalanche was equipped with one. One owner I know of said the garage refused to put a tranny cooler on his saying it already was factory equipped.
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Old 07-15-2011, 04:01 PM   #17
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Could the factory cooler on my Tahoe be the little finned thing about 2" square and 15" tall running vertical in front of my ac radiator on driver side with 2 metal tubes running throug it?
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Old 07-15-2011, 04:14 PM   #18
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Could be, trace the tubing if it heads back to the transmission that's it.
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Old 07-15-2011, 04:23 PM   #19
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Originally Posted by Fourn3833 View Post
Could be, trace the tubing if it heads back to the transmission that's it.
1 line will probably come from the radiator, and the other running back to the transmission if that is indeed an auxiliary cooler.
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Old 07-15-2011, 04:43 PM   #20
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Originally Posted by Fourn3833 View Post
Some radiators have coolers built in, but if the water is at 200 plus degrees than the tranny fluid is no cooler, hence the external coolers in front of the radiators.
Almost all vehicles with automatic transmissions have a separate heat exchange for the transmission built into the radiator. Even though the inlet water temperature going into the radiator is 200° (or whatever temperature thermostat is installed), what goes back into the engine is significantly cooler......that is what the radiator does for a living. The hot water goes into the radiator at the top, and goes back into the engine from the bottom of the radiator. Some transmission coolers are located at the bottom of the radiator, taking advantage of the cooler water ready to go back to the engine. Some may run down vertically on the none inlet side of the radiator, but the fluid will still come out of the bottom....the coolest part.

This is the 1st step in cooling down the transmission fluid, and for many vehicles that is enough. But in towing situations where the transmission fluid can really heat up, an auxiliary transmission cooler is needed to further cool the fluid, since the primary cooler my not be able to keep up.
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