I've been having somewhat chronic power steering issues and have hopefully resolved it...just thought I'd summarize the issues and troubleshooting here for documentation sake.
BLUF (for those not interested in the wall of text that follows) - My power steering had gone to s***. I replaced the pump, and now it works again.
History:
I'm running the normal Saginaw setup that can be seen in no less than 100 threads on Mud. Ever since we got it all put together my power steering belt would whine from time to time. I'm using the Bill Dorry pump mounting bracket, the two inner crank and water pump pulleys, and a JRob fab adjuster bracket. The whine would go away once everything warmed up, but it seemed that I could never get the proper tension on the belt. I tried a couple different lengths, but I never could get it just right.
After the first trip out I started to notice that it was getting harder to turn the wheel at idle/low RPM. I didn't think much of it; I'd just use a pry bar and try to tighten the belt from time to time. At GSMTR it had gotten significantly worse. Occasionally I would have to bump the throttle in order to build enough pressure to turn the wheel. This was really more of a nuisance than anything else. At the Ramble, though, I was having to bump the throttle more and more often, and, at least twice, I had to bump the throttle in somewhat precarious situations. It had become much more than a nuisance.
At this point, with the truck at idle, you simply could not turn the wheel. Increase the RPM's to 1500 or so, and you could turn it with some effort. Bump it further to 2000 RPM and you could turn the steering wheel with one finger. While messing with it in the garage the belt would still whine, and I still couldn't get it as tight as I wanted. I was convinced this was the issue, so I returned to these 100+ power steering conversion threads on Mud. Finally I found the adjusting bracket I was looking for:
I have no idea how I missed this the first time around (I must have been half asleep during the power steering research days), but, after a couple of texts to Georg, I had one on the way. I also ordered another belt that had been documented in the same thread where the pic above was found.
Last weekend I finally had some time to mess with it. After a few beers and a trip to the hardware store, I had my setup pretty much looking like the one above. Cranked the truck up and could just barely turn the wheel. s***. When I looked in the reservoir, I noticed some small bubbles, so I began the lengthy bleeding process I had also just discovered in one of these PS threads (essentially the same thing John had had us try at the Ramble). I got the front wheels off the ground and cycled the steering wheel from lock to lock about 40 - 50 times. Then I started the truck (wheels still off the ground) and turned them some more. The wheel turned very easily, and I thought I had it licked. Put the wheels back on the ground, started the truck, and was back to square one...wheel refused to turn.
At some point during all of this I noticed that the fluid looked a little dirty. OK, there's still beer in the fridge...let's flush it. That was fun. I made a hell of a mess on the garage floor, and went through 2 - 3 quarts of fluid. Once clean fluid was running out, I buttoned everything back up, got the front wheels back off the ground, and started the bleeding process all over again. This time I had lots of bubbles in the reservoir and after starting the truck (with the wheels still off the ground), the fluid in the reservoir was foaming. Repeat the bleeding process. With all the air out of the system I put the front wheels back on the ground, started the truck, and realized I had accomplished exactly nothing.
Sunday night I ordered a new pump.
Side note regarding the pump, since I apparently slept through the power steering portion of this build - there are several variations of these pumps: ones with keyed and non-keyed pulley fittings with 'external' or 'internal' threads to accept either a nut or a bolt, ones with flared or o-ring fittings on the high pressure output, ones with attached or external reservoirs, etc, etc. The pump I'm using is part number 20-6000, and the source is a 1972 Camaro (I'm sure there are others...this just seemed to be the most consistent one when browsing the online parts houses). I'm using the billet pulley (sourced from Georg, but I'm pretty sure it's the one from 4+ sold by Man-a-fre). This uses a keyed fitting on the pump and a retaining nut/washer outside the pulley (i.e. pump is a variation with a threaded end). On the high pressure side, this pump utilizes a flare fitting. All of the mounting points utilize 3/8" fasteners.
At the Ramble Bossman had told me about a mod folks used to do to these pumps to increase the output pressure at low RPM's...said it had something to do with adding washers somewhere. When I got back home I found this link:
http://www.ih8mud.com/tech/woody/ps-pump.html
Last night, before putting everything back together, I did this mod on the new pump. A few more beers and I had it all back in, buttoned up, and the wheels in the air ready to bleed it again. When I got back on the ground around 11 it turned like butter (not sure I understand that simile, but it's what I've read in these threads when folks are happy with their setup).
I'm still running the newest belt I ordered (Gates 7475), but it's pretty narrow. Apparently this supposed 4+ pulley was designed so you could run the 'normal' wide belt. I'll probably swap back to one of the ones I was using originally as they make good side contact, whereas the belt I've got on there now rides on the bottom of the pulleys. From what I understand, that is not ideal (comments welcome).
If the weather allows I'll run it some this weekend to make sure I didn't proclaim victory too soon, but hopefully this problem is behind us.