Well, u-joints on the rear driveshaft took a crap on me. Paid $30 for a pair of new Moog u-joints and a few hours later (of beating the piss out of these rusted, old, 216k mile u-joints) it was done!
The worst one was the diff-end u-joint, by far.
A few tips; make sure the clips line up properly in the yoke on the rear diff, I didn't at first and it was a source of struggle. Also, have a pick to clean out the lip for the retainer clip, you'll need it. Lastly, if the new u-joints are VERY tight, you've probably spread the yoke on the driveshaft with all the beating. Keep a set of calipers on hand, turned out mine ended up almost 0.010 out of square, a hammer and board fixed that really fast once I figured out what was going on.
Driveshaft out of the truck, this was the super-easy part.
New u-joints, really glad they were the problem solver!
After soaking for at least an hour in Aerokroil... they were seriously stuck in there.
Just this little bit of motion took a LOT of beating with a hammer.
The setup for beating with a hammer!
There were definitely a few on this one seized.