I recall seeing UCAs with the ball joints centered in the arm, but now I don't remember what they were on, I am thinking 4wd trucks, but I don't think they had them on 720 4wd trucks, at least my 1980 4wd had the same UCAs as the 2wd trucks.
If the HB 4wd UCAs are at least 5/8ths longer it might work, depends on where the ball joint is on the control arm, the 720 arm reversed is perfect offset to the rear, the castor adjustment is almost dead on, at first I was trying to shim the arms to get the ball joint back to the proper castor, but the bolts kept breaking as they were getting bent when I tightened them down because of the UCA mount shaft being so angled, I finally figured out to reverse the arms and it drove perfect.
But everyone reading this has to remember that we are talking about mounting this stuff on 521 frames, and I will repeat again, the UCA mount blots on 521 trucks are TOO SMALL, they should be drilled out to the 720 mount bolt size, being I have never done this myself I don't know for sure it can be done as I have never really looked that close at the nuts/metal inside the shock tower too see if there is enough metal to be able too drill them out and thread them to the larger size bolt.
Its a mash of 720,d21,521 and more. Only 2 people know how to do it. Jim from top jimmy motorsports in tracy ca and a dude in mexico.
Jim completed my ball joint conversion earlier this year. Its amazing to have a proper setup. Total cost with parts fab and labor is about $2500 or so. I dont have an exact price due to he also added straightening the front end after my crash.
I can provide the info if needed.
Make that 3 people as I have had a ball joint front end on my 521 since 2005, I even have power steering, but I didn't flip the 720 upper control arm as my work truck is not lowered.
All they are are 620/720 lower control arms or one can use the hardbody LCA with the pressed in balljoints, 620 LCA disc brake bushings, I have 620 tension rods but it appears you used 521 tension rods, lengthened(3/4") 720 upper control arms, and the disc brakes you want in between the ball joints, I have 1990 V6 hardbody dual piston calipers, but the 1985 720 disc brakes are popular, I had everything used or I bought it cheap as I could as I didn't have that much money to throw at it, I also still use the torsion bars.
I didn't have to make any changes to the shock towers as I am using stock shocks also, I likely have less than $300.00 into mine including the Hardbody disc brake assemblies I bought from Yello620 for as I recall $175.00 used, I was using 620/early 720 disc brakes at first as that is what I had.
But I had to figure out everything to make it drive correctly myself as I did this on my own without forums(2005) as I didn't even have a computer back then, Mike K came over and looked at how I did it, I don't recall how he found out, maybe he came to look at how I did the power steering, that was a long time ago.
The key to making this work is the upper control arm connection, the stock 521 UCA mount bolts are not big enough, if I had it to do all over again I would drill the mount holes out to except a 720 mount bolts, I had it aligned and the guy at the shop said I had everything within 2 degrees, it drove great, it corners like a race car when empty, but most of that has to do with the rear suspension, as I can haul loads on my truck.
I am actually retiring this frame this winter, it was never meant to have power steering and it has taken it toll on the driver side front frame.
You would be surprised what a person can eat if they workout 3/4 hours a day 4 days a week and have an 8 hour job 5 days a week also.
People would start staring at me after I downed my my second heaping full plate at the Mongolian Grill and was heading back for my third or even my forth plate, I loved that place, I would actually get full there, I only weighed around 150lbs back then.
You should really have an external backup of everything and not just on one computer. I recommend picking up an inexpensive external hard drive. You can get terabytes these days, cheap insurance.
I miss XP too.
Sorry for more hijacking...it happens around here
I have an external backup, but like all things having to do with computers I have know idea if it is working properly, I cannot see it working so I have no idea if it is working properly.
I know that every once in a while because of Photolame I have to get into my old computer and email a photo to myself so I can save it to this computer, then I can upload it onto Postimage to be able to post it here.
The reason I don't believe that the external backup is working anymore is that I had to restore that computer twice within a week of each other as windows was corrupted, after restored the only thing left from before was my photos, everything else was gone except what came with the computer when I bought it, after the first restore I re-installed Google and the computer only lasted a week or two, it kept uploading updates and such and was getting sticking hot, so the second time I restored it I turned off all automatic updates and I didn't install Google and months later it is still just fine, but it is in sleep mode most the time now.
It's easy to go too tight on oil pan bolts, I put the palm of my hand over the center of the socket connection to the ratchet wrench and I twist lightly going several times around the pan, I do not twist tightly, 6 foot pounds is easy to achieve, actually too easy to achieve.
You appear to have what looks like cab/chassis leafs with an extra piece on the overloads, I have 2 sets of them that came from dually trucks.
The set I posted a photo of were on a stretched heavy duty 720 truck with a huge flatbed and aftermarket dually rims, they were using that truck to store other vehicles on the flatbed, the leaf that goes over the axle rested on the rear bump stop when it had weight on it, it also had longer heavy duty shackles.
Is your truck a flatbed or does it have a longbox, it doesn't appear to be a dually.
I have more time into my builds than money, it takes time to fabricate stuff, my 520 is so modified that I can say I modified the modified, I have massive hours into that truck, and that truck attracts the most attention at stores/gas stations/in my driveway than anything else I own, I always have someone asking if I will sell it, I put a car cover over it to hide it.