We should start at cheap and usally first to fail items. Next I would check your fron hub assemblies, alot of times the bearings will fail. To check that you must jack up one front wheel. Grab the top and bottom of the tire firmly and rock the tire back and forth. If there is movement the bearing is bad. Do not rock it side to side because it will move due to the steering. You can also tell because when you drive the bearings will heat up but this heat is usually a sign after extreme damage.

Jeep
Jus' sayin'