I did a little poking around, and tinkering on the truck over the weekend.
I confirmed that I do have a brake fluid leak, coming from the flared fitting on the hard line, to the right rear, at the T on the axle. I did that, I'm the one that put the new hose in. I don't think I got it cross threaded, but I'm not sure the hard line was lined up as well as it should be. I picked up some flare nut/line wrenches, shameful I didn't already have any. I did my darndest to keep the line straight, and snugged it down with at least 30 Lee-Lbs, that's one good grunt.
When I briefly glanced at it on my way out the door this morning, the blue shop towel I'd crammed in there as a "leak indicator," still appeared dry. Keep your fingers crossed.
In plausibly related news, I have occasionally been locking up the right rear tire, during abrupt braking. Gradual braking to a stop, no issue, but if I have to stop a little quicker, about 1/3 of the time the right rear will lock up. Related to the that line leaking I assume? If it's air I thought it'd just feel spongy though, not lock the wheel up. The ABS doesn't work, the light is constantly illuminated on the dash.
I got under the truck, with a flash light, looking things over. Something's leaking in the power steering pump-ish area, likely power steering lines or reservoir. Not of major concern at the moment.
Wanting to address the Blimpiesque (Popeye reference anyone?) steering response, and sloppiness, I got under the truck, grabbed hold of the tie rod, and drag link with both hands. Granted I'm no Popeye myself, I'm merely Lee, I'm pretty great don't get me wrong, but I couldn't get anything to budge. The TREs all seem tight. My next guess is the rag joints in the steering column. There are 2 rag joints, one at the box, and one at the firewall. There's a company called Borgeson, that makes a replacement steering shaft that replaces the lower rag joint with a universal joint. The aftermarket shaft seems to be a popular upgrade for these trucks, I've already got one in my Amazon shopping cart.
It seems that the steering box could physically be flexing, or have even cracked the frame. Apparently that's a thing, and there was an OE steering box brace added at some point during the manufacture of these trucks, to alleviate that problem. My truck being as old as it is, of course doesn't have the steering box brace. I'm going to have to get Jewels in the cab, turning the steering wheel while I'm under it looking things over.
I confirmed the radio does work, at least FM. It's just, there's only 1 speaker, it's in the passenger door, and it's so quiet you can't hear it when the truck is running.
The nickel-and-diming has commenced! I've recently ordered:
White LED reverse lights
Oil pressure sending unit
ABS sensor
Brake bleeder screws
1/2" D ring tie down anchors
Chilton manual
Acorn lug nuts
This is going to be several nickels and dimes, I have a set of tires with my name on them, and an alignment scheduled for Friday afternoon.