This issue has been going on for a few months yet and the diagnosis has been inconclusive so far. Between 60-70 mph all of my steering shakes pretty good. It doesn't happen every single time I hit this speed, but I'd say about 85% of the time. I have checked all of my steering components to check for anything loose and a drag link was loose, replaced that and no difference. Everything else is tighter than hell, got my tires balanced and aligned, and I don't believe it's a wheel bearing because it doesn't always happen when my steering wheel is turned. Though I do notice a humming sound at slower speeds too that doesn't sound like the noise of A/T tires. Please help, I need some sort of help and don't want to get ripped off at a garage somewhere

 

First i'd rotate the tires to see if the vibes go to the rear.
While rotating the tires a good time to check the wheel bearings.
I wouldn't just assume they're ok.

Check for any play in the steering gearbox, pitman arm, etc.
Crawl under the Jeep (on the ground-not lifted) and with a helper turning the steering wheel listen for clicks and/or any play.

Check the track bar mounting bracket, bushings.
Check the motor/tranny mounts.

 

What if i hear clicking during the turn? Mine also does this and it seems as if something mechanical is hung up and deceleration the truck. Btw mine is an 05 grand cherokee 5.7