Heya Overkill,
I'm assuming you have power steering on your RC. The box you have is a Saginaw model 800 (or so), there are preload adjustments that must be done to them before you install them on your truck. I went to the parts store myself and checked them out. This box is used in HUNDREDS of other trucks and when they're made the working preload and sector shaft mesh aren't set from the reman factory because of how many different applications they're used on.
Here's a partial list:
AMC Wagoneer/Cherokee 63-91 (fullsize models- not XJ)
Chevrolet Suburban/ Full-size blazer/Pickups
W/D series Dodges/ Plymouth traildusters
well you get the idea
Anyway, this is how you set preload. First you'll need a dial indicator in-lb. and ft-lb. torque wrench (a beam style should work ok too), a shop press, a vise, various combo wrenches, a screwdriver or allen wrench set.
Here goes:
1. Remove the box from the vehicle, detaching the pitman arm as well.
2. Take the box to the shop press mount it with the rag joint/ input shaft pointing towards the floor. Press on the rear cap and remove retaining snap ring w/ screwdriver, slowly retract press and remove end cap and plug spring. Remove box from press.
3. Set up box in vise. Inside the box there will be a square plug threaded into the control valve. That plug is the worm bearing preload adjuster plug, turning it in tightens the worm shaft, turning it out loosens it.
4. Find a way to attach your torque wrench to the input shaft/rag joint (a socket and duct tape might do the trick) and turn the shaft back and forth while tightening the adjuster plug. You should measure between 18 and 22 in-lbs. Ignore breakaway torque, the amount of force it takes to start moving the shaft.
5. Next adjust the sector shaft. The sector shaft adjuster screw is opposite where the pitman arm attaches (on the top of the box), the screw will be adjusted by undoing the locknut, and then turning the screw with either an allen wrench or a screwdriver (it really depends on the box manufacturer, model, weather- lots of things). Turning it in tightens it, out loosens it. Turn it in until resistance in the input shaft increases slightly, about 5 in-lbs over your previous reading. If it feels notchy as you turn the input back and forth, back the screw off some until it feels smooth.
6. The box is now adjusted. Reinstall the plug spring and end cap, with the tapered end against the cap (if the spring is tapered- sometimes it's just a standard coil which goes in either way). Use the shop press to compress the spring and cap back into the box bore, and reinstall the retaining snap ring.
7. Reinstall the box into the truck, connect all of the steering components.
8. Double check play at steering wheel, front wheels should turn as soon as the wheel turns. Some play might be noticeable, but it should be minimal- like 1- 10 degrees free play before tension is felt in the wheel.
9. At this point your box SHOULD be completely adjusted, and there should be some slack in the box to prevent excessive wear on the ball nut and sector gear. If steering feels notchy, back off sector shaft adjuster screw.
This last step is pretty critical:
Jack up your front end, turn the wheels full lock left, fill the pump resevoir halfway, start your engine (make sure the e-brake is applied and the tranny is in neutral or Park), then turn the wheel back and forth completely at least 20 times (seriously 20), then fill the resevoir until full, turns wheel back and forth another 5 times. Shut off your engine, lower the truck back down, and you're set.
That last step purged the air from your power steering system, box, pump, lines. Air in your power steering will cause sloppy, erratic, and difficult-easy-difficult steering feel, and sometimes wander.
Sorry for the long read. I hope this helped. Alldata should have the manufacturer specified worm bearing, and sector shaft pre-load adjustment specs if you want to double check. Good luck.