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Its weird but ihavent got to check it yet but it only does it at about 80mph the floor shifter to get the truck in 4wd vibrates like hell about 80 then if i go faster it quits and slower it quits, i dont know what it could be maybe the sticks loose, etc, any ideas. oh and its doing it in 2wd i havent checked to see if it does it in 4wd yet
 

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Oil level. You oil is low or burnt in the transfer case. If it's burnt change it. If it's low, check the rear seal to the driveshaft (look at the floor pan for spray line.)

Even though it is part-time 4wd, there is still a clutch pack in there. If the oil is burnt or low it may be damaged.

The only other thing is maybe someone used something other than ATF DEXRON in your transfer case.

Also, front axle oil low or a bad u-joint can do this.
 
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