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Old November 7th, 2010, 07:30 PM   #21
bigblockford79
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I was thinking about doing this on my wife's 99 expo 4.0, but since hers doesn't have a CAD or lockouts it doesn't change anything, especially for wear. All the components will still be moving, they just will be coasting instead of having power supplied to them. I can't imagine a CV of u-joints life span being affected much by having it coast vs. handle power. Lets face it the 4.0 isn't much of a joint snapping power plant.

Excerpt from a site I found in my research:

"'97-'01(switch says, 4auto, 4high, 4low

The '97-'01 model years lack a true 2 wheel drive option. With a live front axle, there are no significant mileage gains to be had by driving the rear wheels alone. That being said, some of us simply prefer to determine when the front wheels should drive and when they shouldn't, instead of relying on a computer to make that decision for us."
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Old November 7th, 2010, 07:32 PM   #22
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On tight turns into parking spots etc....you can tell the difference between AWD and 2WD.
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Old November 7th, 2010, 07:45 PM   #23
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My 05 Silverado has auto 4wd and I hate it. Luckily it has 2wd as an options as well. I've found that the Auto is very noisy, even more so on the expressway. I don't blame you guys for wanting to get rid of it.
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Old November 7th, 2010, 07:45 PM   #24
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Quote:
Originally Posted by CheapThrillB2 View Post
On tight turns into parking spots etc....you can tell the difference between AWD and 2WD.
I don't understand HOW this would be possible. All the same components are still turning. Just not under power. Oh Well, another one of life's little mysteries.
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Old November 7th, 2010, 07:50 PM   #25
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In my case, with the higher mileage on the tcase cause the clutches and fluid to breakdown and it doesn't operate as smooth. If I am gonna replace it might as well go with a 2wd/4hi/4lo option instead of the same bs I have going on.
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Old November 7th, 2010, 08:15 PM   #26
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i can tell you first hand .it is way better not in awd.major diffrence in turning and just regular driving.
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Old November 12th, 2010, 09:17 AM   #27
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FWIW, on my yukon (2wd/auto/4high/4low t-case):

My front driveshaft u-joint was making noise two weeks ago, so I pulled the driveshaft to replace both joints, and kind of forgot about it. I'm receiving EXACTLY the same MPG as I was without it.
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