Re: Steering, E150 van
You're right about the I-Beam suspensions. The bushings do tend to wear out and things get a bit sloppy. The steering box can also cause the slight wandering if it's out of adjustment or on its way out. I personally have adjusted the steering box on my Bronco twice in the past 80,000 miles and it has taken care of the problem. I would start by having a friend turn the wheel back and forth (engine off and e-brake on) while you visually inspect the moving parts for any obvious issues. You should be able to track down any major problems this way.
It could also be that the entire steering system is just showing its age. All moving parts wear and their slop will add up to give you a lot of total "play."
1992 Ford Bronco
E4OD- B&M Stage 2 shift kit
Full 3" stainless Bassani Exhaust
32" BFG's/stock suspension
"No replacement for displacement."
"Our lugnuts require more torque than most Honda's produce!"