On your 89 you should have the lator o-ring style sttering box, the main differance is the high pressure line, you can however swap parts from one pump to the other to make is the o-ring or the pre-81 style.
the best route, for the time and effort to swap a sector shaft go to a junk yard and look at your 1 ton box service trucks or crew cabs, some of those trucks you can find alot of rebuilt parts on or reman parts. I found a complete box nice tight with no leaks and fresh reman a few years back, 20 bucks later that sucker was mine!

Just poke around and you might get lucky. Or post up here, ive sold a few sector shafts to other members on here.
My main point is that doing it once is always nice, also with cross over when you have a tire compress under flex it tends to get less input from the steering. without cross over, the drag link moves and renders your steering all but useless! for the price of the steering block and studs plus the new superlift pitman arm you are a 1/3 or 1/2 way there. Its nice piece of mind to, hell paint it a bright color and you can smile evertime it catches your eye
I would call up ord, sky or wfo.
I personally have bought 3 set ups from wfo, or was it four

at any rate I really really like his customer service and trevor treated me right, 3 of the 4 times the part shipped the day ordered it, and one of the times I goofed and gave a bad measurement, he sent the other one my way before he recieved the return. Another time he mailed the parts before the money order was in his hands and I made my dead line because of it. He treated me nice even when I was a cocky 17 year old, nice parts, nice prices, great service and he will have my business again even if he is not the cheapest.
