1988 F150 2wd front end

I have a 1989 F150 2wheel drive
something but not all the time the front end will start to shimmy and almost feels like a bounce and always on the right side, I have checked both upper and lower ball joint's, tie rod ends, and wheel bearings (I checked the bearings because I had a similar problem on the left side and the bearing race was loose in the rotor) had the tire's checked and ballanced then put new tires on and it still does it, but not all the time.
if it's not doing it when I first start out it will not do it at all but if I take a corner it will start doing it when I start going straight again, and it doesnt matter how fast I am going or if I speed up or slow down.
any one have any ideas?

When my 87 was doing that, it was the tie rod ends.

Make sure the I-beams are tight at the frame mounting point. That caused problems for me before

You didnt mention if you had replaced the shocks. I did and my problems went away for that week.... ;)