Yesterday was reassembly day.
I noticed the breather hose from the diff motor over to the T was cracked so replaced both with the case still on the bench.
Getting the damn thing back in the truck was quite challenging, mainly because my transmission jack + the case was too tall to slide under the frame...as such I had to wheel it in on my creeper and then transfer the case onto the tranny jack under the truck--this was hard and not recommended (though I'm not sure how else to do it tbh.)
And I'm done! Made one stupid mistake when reassembling (forgot I had put the lever in "N" not low range when pulling the driveshafts, and as such my diff motor was clocked wrong...required me pulling it off and reindexing it, thanks to
@OTRAMM for the advice via email.)
Now that I cleared that up, all is aces.
I was quite concerned with the potential gear whine, and I'm happy with where it came out...the gears are audible at highway speeds if you listen for it, but only when on the throttle and it's quite minor (my girlfriend couldn't hear it when I asked her about until I deliberately punched the gas and came off it repeatedly so she could notice the difference...it's quieter than the wind noise is on the highway so I'm not concerned.) Maybe if you have a ton of sound deadener in your rig it would be more noticeable, or maybe I got lucky with the gear mesh pattern...but for those on the fence due to noise concerns I'd say no regrets on this side (and I am pretty sensitive to sound.)
The low range gear seems fun! Going to hit up Eastern Sierras for a camping outing next weekend so hope to put the crawler gears to the test.
Thanks all for the support and advice along the way.