Originally Posted by Gotlift04
My mom has a 2006 Armada. It has a slight vibration and light noise coming from the front. When the 4 wheel drive is engaged the noise is very loud and sounds like rattling. Any ideas where to start? Wheels are balanced and just had an alignment.
You may also want to check the front hub assemblies. My right just failed completely and I am replacing the left one, too. Since these have the ABS sensor embedded in them, you can get some tricky situations when the hub goes bad. Braking will be erratic and 4WD may try to engage since it's noticing a slip from the sensor. The behavior gets really strange, really fast.
The hub assemblies are not very expensive, and with a 2006, you're probably due to have them replaced. I certainly was WAY overdue as mine failed during a roadtrip back from Thanksgiving.