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Re: 1999 expedition clunks when in Auto 4wd on slippery...
That sounds like play in your rear end, it usually happens to all RWD vehicles at some point in their life, and also, check your U-joints, and tranny fluid. If low on fluid, your trans can slip causing a lag in shift.
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Check to make sure all of your drive shaft U joints are in good condition. Unless you have a full time 4 wheel drive you shouldn't run on dry pavement in 4 wheel drive for very long as stress builds up in the drive system. 4 wheel drive is best for slippery roads/mud/ dirt conditions.
never use 4wd on dry pavement even just wet pavement can cause this. 4wd is for only snowy or slippery conditions
unless this is automatic 4wd or awd than u have a problem id suggest you find a forum for youre vehicle and post it there find one by googleing gmc envoy forums or chevy trailblazer forums as they are the same thing
Yes there is a chain in the transfer case and yes it could be a u-joint also. You shouldn't be in 4wd high or low on pavement. this is what happens and it can be very expensive to fix. Check all your u-joints first as they're easiest. Is this jeep setup with ujoints inthe front axle or are they cv-joints? good luck... and use 4wd properly only on slippery surfaces!
When engaging the 4WD system, you are pulling the lever on the Transfer Case right? Not the transmission, it's a different gearbox.
There were several versions of transfer cases that used both full and part-time 4 wheel drive.
From your description this sounds like a part-time transfer case.
Going with that, it is somewhat normal to hear and feel a mild clunk when engaging 4WD high range, especially if you are at a complete stand-still or under full throttle.
Try engaging 4WD High while slowly rolling at idle - no throttle. It should pull in fairly smoothly.
Once 4WD is engaged it will literally LOCK the front and rear axles together. So do not do it on hard dry pavement. These older style 4WD systems need a little "give" especially when turning. The engineers assume you are not engaging 4WD unless you are in a somewhat slippery scenario.
Many CV joints, axles, U-Joints, differentials, and transfer cases are damaged and broken by folks who don't understand this.
Reading the owners manual should provide a clearer description of what you've got.
Bear in mind that when you come out of 4WD it may not completely release, again due to hard pavement binding up the axles. You can try this: backing up 10-25 feet in a straight line, or getting one set of wheels on the shoulder or in some gravel. That should allow it to release the transfer case and go back to everyday 2WD high.
I hope this helps.