Please help!!

[Lifted chevy 03]

I have a 03 Chevy Silveradoext cab 4wd. I recently put a 6" lift and LT315/75R16 tires on it and along with new step bars. Everything rode really good and smooth. Heres the problem im having the other day I switched out my cab body mount bushings with some new prothane bushings since I had a few of them missing. Now when I hit a bump the front right tires shimmies pretty good no matter what speed you are going or if you are on road or offroad. I have checked to make sure all bolts are tight and its all good. What could it be or what do I need to check? TIA

[00Silverado4x4]

Tie rod ends, ball joints, pitman or idler arms could be worn out. Jack up the front and start rocking tires until you find the problem area.