Question about 1997 GMC Jimmy

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My 97 Jimmy is shifted into 4hi and will not switch to 2hi, the lights flash and i hear a clicking but it wont shift

We got a snow storme about a week ago, I pushed the 4hi button, it flashed then went into gear . Now when I try to get it into 2hi it flashes, i hear gears clashing but it wont shift.

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When deactivating youre four wheel drive make sure youre rig is in nautral this helps with the gears lining up. whan youre 2-hi light flashes hit a second time. Ive had this problem befor.

Posted on Jan 12, 2013

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Posted on Jan 02, 2017

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SOURCE: on my 2000 chevy S10

vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.

Posted on Jan 21, 2009

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Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
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