1999 GMC Suburban 4 wheel drive

1999 GMC SUBURBAN
140,000 MILES • V8 • 4WD • AUTOMATIC
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DKMSTI
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My Suburban will not go into 4 wheel drive, high or low. it clicks like it wants to when i push the selector button. In addition when i drive on the Highway at around 60 mph while feathering the gas, it will make horrible klunk in the front end almost like it wants to lock up the front axle. very scarry.

what can i do to fix this?
Dec 11, 2008 at 7:24 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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