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4x4 only works in low

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Old 02-05-2016, 10:13 PM
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Default 4x4 only works in low
My 4x4 for some reason will only engage in 4 Low not 4 High, the shifter does feel like it engages and the linkage is fine from what I can see underneath. any ideas?
 
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Old 02-05-2016, 10:20 PM
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Put the t-case in 4 high, crawl under the truck, and try and rotate the front driveshaft. (engine off, trans in park.)
 
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Old 02-06-2016, 09:48 PM
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Make sure the tcase isn't slipping into neutral.
 
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Old 03-06-2016, 06:57 PM
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sorry for the delay, but when the t-case is in 4high I can not move the front driveshaft more than a quarter turn in each direction.
 
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Old 03-06-2016, 10:00 PM
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Then the vacuum system is your problem. Check and see which port is getting vacuum at the cad. (on the front axle.) should be the inboard port. May just have a leak somewhere.
 
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