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Joined: Dec 2011
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Joined: Dec 2011
Posts: 337
My 99 Silverado Z71 had a new transfer case at about 150K miles. I used the auto feature all the time (winter in AK) I knew It was going because I could hear the chain slapping the case.

On the other hand, my wife's 03 Trailblazer has the same feature. It stays in auto all winter, currently has about 140K miles on it and the transfer case is as tight as it ever was.


"Noone has a more intimate understanding of, or deeper appreciation for freedom than a soldier who has fought for it in a country where it does not exist."
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Joined: Mar 2006
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I have an 04 Chev 1500 Z71 with 265000 miles and just replaced the transmission for the first time. Usually run in 2 hi except when road conditions are variable and then in auto mode. Mileage is about 18-19 overall with not much observed difference except when I go to 4Hi which drops mileage significantly .

Joined: Mar 2006
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Originally Posted by 7mm08fan
Interesting question - I leave mine in 2hi - have a 2011 with the 5.3L V8 - what engine do you have and what mpg are you getting? I'm currently averaging 18.4 with around town mixed with short highway. 20.8 to 21.1 on hwy at average 72mph


I have the 5.3 L Fle Fuel engine on my 2011 Z71 Silverado and I get nowhere near that kind of mileage, especially in winter!

Aroound town and short highway i would say I average 15 to 15.4 mpg.


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Joined: Nov 2008
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I had an 05 z71 crew 5.3L non FFV and only got 15-16 or so in mixed driving.

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