This worked for my '93 model. It drives straight and no vibration. However, the steering wheel is crooked when the wheels are straight. I'm guessing that's an alignment issue?

 

Yes, but this is something that you could do. On the steering components, find the power steering box. Mounted to it is the pitman arm which connects to the drag link (also called the center link). On this drag link somewhere is an adjustment band. Turn this a couple of rounds and see if it improves your steering wheel alignment to center. If the steering wheel is even further away, it means you turned the adjustment band in the wrong direction. Try it again. This only changes the distance between the pitman arm and the driving tire. Since the tires are connected with another rod, the distance between them won't change and cause alignment issues. Most vehicles use a similar setup (with a few exceptions).

Here's a diagram:
http://hosting.kyozou.com/mac/f250_steer.jpg

 

Yes sir thanks for that info, I'll give this a try when I get a chance.

 

That's NOT how to straighten the steering wheel - that's how to screw up the toe. You can't align any vehicle at home; least of all, one with inverted-Y steering linkage, like these trucks. Take it to an alignment shop with a modern optical alignment machine (big reflector panels that clamp to the wheels) and let them do it right.