2005 GMC Canyon front end shimmies

Shakes or Wobbles problem
2005 GMC Canyon Four Wheel Drive Automatic 160000 miles

When I reached a speed of 60 or more I have a front end shimmie. The steering wheel shakes so bad that I can hardly hold on to it. I had the tires checked, they are fine I changed the shocks on the front end, Changed the tire rods, inner and outter and changed the wheel assembly. But the shimmie is still there and didn't get any better. I didn't check the engine size because it is a 5 cyl. I hope that you can answer this question and give me some idea what to look for cause I really can't afford to take it to the garage. Thank-you