2008 Ford Ranger and there is a shimmy in the front end. What causes it?

What is your question?

It has been pretty noticeable of late. I have had the shocks replaced, as well as ball joints, and bearings. I just had to put on new tires due to this and it still shimmies. this generally occurs between 40 and 45 mph, and of course on higher speeds. I know the truck does not ride like a Cadillac but I cannot afford the tires.

What makes this problem better or worse?

Mainly at the speed of 40-45 mph. Today noticed the shimmy at 60-65 mph

How long has your 2008 Ford Ranger had this problem?

From almost since I bought it in 2008