learned something new.... I worked on three 80's last weekend, and found that when I worked on boost, when I jacked up one wheel, put transfer in Neutral, I could spin the hub. Tried the same on Lexi, and it would not, then Josh's truck and it still would not...
Ends up the answer is the viscous coupler is seized. here is a thread about getting rid of it.
built an anti wrap bar for my front axle so I don't destroy another set of front springs
installed a replacement set of leaf springs which pushed my front axle forward and now have an 80 degree approach angle
A little fiberglass repair.
as well as a few other things I didn't take pics of such as reposition the steering wheel since the new seats are taller, fixing a leak in my oil pan, moving my winch fairlead
The contacts on the bulb in the socket are probably loose. If it goes out again try to smack the dash above the panel to see if it comes back on or flickers. Mine did this quite a few times before I replaced all the bulbs with LEDs. A truck a did a front axle rebuild had the D light come on after I buttoned it all up.