1999 Cherokee 4x4 I6 143K.

I feel slight wobbly vibrations in the steering wheel when I hit 60mph on the highway but then smooths out closer to 70mph. I ask a mechanic if he thought if was the shock stabilizer and he suggested maybe the tires were not mounted and balanced properly. Any suggestions?

 

Could be many things.

Slight wobble at speeds... I'd suspect the control arm bushings.

 

Get the tires checked before you start tearing into things. A bad belt could be bad in one of the tires and could be felt at certain speeds.

 

mine was the track bar bushing at 53mph it gotta shake then smoothed out at 55+. just have someone start it then watch the track bar to see if it gives when they turn it side to side

 

I had the exact same symptom on my 99 and it was the track bar. My vibe eventually turned into "death wobble" before I properly diagnosed it and replaced the track bar.Even though you may not have death wobble now, the suspects (listed below) are exactly the same.

I always start with tires though; try swapping the fronts to the rears.

Good luck and be sure to keep us updated!
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-Front tires out of balance (try swapping fronts to rear; see if symptoms change)
-Tire pressure. Don’t laugh.
-Improper lug nut torque on wheels
-Front alignment out of spec
-Loose track bar
-Worn track bar bushings
-Worn track bar (check for play!!)
-Bad control arms and associated bushings
-Worn/damaged steering stabilizer (not generally a cause in and by itself)
-Worn/damaged shocks
-Worn/damaged tie rod end
-Bad U Joint
-Bad ball joint
-Loose frame mount
-Steering box loose