rg2200
+1y
My son did it in his '89. He picked up the parts off craigslist. I'm not certain that I'm remembering all the parts you'll need, but here goes:
Power steering box itself
Power steering pump
Power steering bracket with the tension adjuster (I forget if it was just one/same bracket for a/c and p/s pump)
Ensure your crank pulley has enough slots for all the accessories you currently have, plus one for the p/s pump. If you have A/C, you'll need to have a 3-slot pulley, IIRC. I think that most trucks came with the 3-slot crank pulley, but remember that some people only had 1 or 2.
correct length v-belt
high pressure hose
return hose (should include a section of metal tubing that mounts on the frame to act as a very basic p/s fluid cooler.
I think, not sure here, that the steering box's splined output shaft for the pitman arm changed in about '91.
I also believe that there's a wire that goes from the p/s box that 'idles up' the engine - increasing the rpm slightly when the engine is idling and you're cranking the steering, to keep the engine from stalling under the additional load - much the same as how it works for the a/c when the compressor kicks in.
It was a few years ago that he did this conversion, so my memory of the details is a little hazy. It sure made driving the truck easier, though, with the power steering, particularly with the wide tires he had on there.
As for the install, the toughest part is getting the pitman arm off. The best thing is to buy/borrow/rent a pitman arm removal tool (about $20 to buy). You might need to heat the pitman arm with a propane torch to get it off (I had to on my '93 when I replaced the pitman arm, along with the ball joints, idler and tie rod ends.) Other than that it's fairly straight forward. If you have A/C (my son's truck did), I think we found it much easier to unbolt the a/c compressor and rope it out of the way carefully - don't unhook the hoses or you'd release all the refrigerant - #1 illegal, #2 you'll have to pay to have it recharged.