Originally Posted by Orv
IIRC the problem is the truck boxes have a different number of output splines, but the truck pitman arm is not suitable for a van. Probably fixable with some fabrication, though.
I don't know how the output shaft spline count would affect the steering box overall? (If we're talking which output shaft fits which Pitman arm--truck or van then that would make sense.)
IIRC the E-Series box is pretty much the same as a similar year or era F-Series---when talking with Red Head that was their suggestion. If that's the case opting for a box fitting an F-Series might not be too advantageous.
Naturally a stock Pitman arm which isn't included on any reman'd box would be a huge determining factor whether it would work properly in any one application.
I will add turning the wheels on pavement shouldn't have any ill effects on the steering box. Like most drivers though I don't just sit in one spot and crank the wheels, more concerned with the minuscule tire wear rather than the box, truth be told.