This truck gets a lot of street time, I even drive it to work a few times a month. The Detroit has several annoying tenancies that make me hate it.
-1/8 turn of slop in the driveshaft (part of the design of how it works).
-slides a tire when making a turn from a stop, regardless of how easy you are on the throttle.
-Axle unloads at random times when cruising down the highway, shakes the whole truck and makes you swerve around in your lane.
-Offroad axle unloading while on an obstacle sounds like you snapped an axle shaft and scares the heck out of you every time it does.
I'll never do a mechanical locker again. If it's a dedicated trail rig I'd do a spool or weld the diff, if it's a streetable rig it's got to be a selectable locker.
As far as to what I'm doing with the Detroit...
Someone else had first dibs, but I'm not sure it's worth anything. This 12 bolt and Detroit were in my '72 Blazer before they were in the S-10. I had some bolts back out of the ring gear in the Blazer and banged around through the gears (common problem from what I've heard). I replaced the ring an pinion and drilled the bolts for lockwire.
This worked until I pulled the axle out from under the Blazer 7 years ago. I put it under the S-10 and drove it for a few months before I heard the familiar sound of bolts floating around in my axle. I ordered new gears and a master install kit and pulled it apart. Much to my surprise, none of the bolts had come out, however that didn't change the fact that there were still bolts and parts of bolts floating around in the axle...
Somehow last time this happened (when it was under the blazer) I didn't get all of the missing bolts out...

The gears actually looked fine, so I just installed new bearings (the bolts were actually blocking flow to the pinion bearings so those were shot).
Fast forward to me pulling the axle apart last weekend. There was a lot of metal on the magnet so I opted to toss the gears in that I had sitting in my shed. I wanted to re-use my drilled bolts since that part of the process was a pain in the butt. 3 of the bolts broke off when I attempted to torque them into the new ring gear and carrier, well below the 60ft-lb torque spec (2 of them sheered at less than 10 ft-lbs) which means that something caused them to crack while they were installed (some of the bolts were loose, but held in place with the lockwire).
That tells me that the ring gear, carrier or both are damaged and no longer true.
If someone wants to give me $20 for my trouble and cover shipping they can have it, but 79HeavyChevy gets first dibs.
I had no indication of any problems prior to removing the diff cover and I've probably put 7000 miles on the Detroit since I had it out last year.