The Stovebolt Site Forums The Shop Area General Truck Talk Split Wheel Info for 52 GMC 3/4 ton

Tell you what I did with mine...

I wanted to see what shape they were in without paying a mechanic. I pulled the valve cores and let them deflate. I was able to squeeze the two sides together and get the lock ring out... Should have waited. The next challenge was to unseat the beads. Crowbars, large C-clamps and BFH were all used for this task. It may have been easier if the halves were still locked... More leverage on the beads.
Once I got the tires loose, I looked at the (small) ridges that work against the lock ring. Corroded and pitted. Considered the force on them with a fully pressured tire and decided discretion was the better part of valor... Got solid wheels and tubeless tires.
Take them apart if you want, but find a big truck shop to check them, repair them and mount them. A split rim that lets go could quite easily remove the roof on your garage... And your head and torso if it hits them first.