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Not sure on how the Trailblazer system works. I know that with my wife's Grand Cherokee as well as many other 4Full Time/AWD/A4WD, the AWD selection delivers power to all four wheels all the time but at a different distribution percentage.
ie; 4High might=60/40 (rear/front)
4AWD/Full Time might=70/30 (rear/front)
I'm not saying that these numbers are correct. They are just examples. It usually tells you in your owners manual. I'm just fairly certain that's how they operate. For most sand driving, the 4AWD feature would be a good choice. It also offers your best fuel economy in 4WD as well.
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